Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Leucine, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Leucine impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Leucine-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.
Our Leucine-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.
Leucine Related Compounds
Stable Isotopes
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| (5S,5’S)-Dihydroxy Lysinonorleucine-d4 | Stable Isotopes | CS-T-103031 | 32619-23-1(Unlabelled) | Enquire |
| 4-Methyl-L-leucine-d3 | Stable Isotopes | CS-T-100027 | Not Available | Enquire |
| D-Leucine-d10 Hydrochloride | Stable Isotopes | CS-O-59131 | 271247-12-2 (Free salt) | Enquire |
| D-Norleucine-d9 | Stable Isotopes | CS-T-97256 | Not Available | Enquire |
| L-Isoleucine-[13C6] | Stable Isotopes | CS-I-00659 | 201740-82-1 | Enquire |
| L-Leucine-d10 Hydrochloride | Stable Isotopes | CS-O-59130 | 106972-44-5 (free salt) | Enquire |
| N-(Methoxycarbonyl)-L-tert-leucine-d3 | Stable Isotopes | CS-T-102637 | 920757-35-3 | Enquire |
| N-[(+)-Isojasmonoyl]-(S)-isoleucine-15N | Stable Isotopes | CS-T-96917 | Not Available | Enquire |
| N-Boc-L-tert-leucine-D9 | Stable Isotopes | CS-O-34759 | 1158083-37-4 | Enquire |
| N-Fmoc-L-isoleucine-d10 | Stable Isotopes | CS-T-96958 | Not Available | Enquire |
| N-Formyl-L-leucine (3S,4S,6S)-3-Hexyltetrahydro-2-oxo-6-unde... | Stable Isotopes | CS-T-96951 | Not Available | Enquire |
| N-Formyl-L-leucine(1S)-1-[(2S,3S)-2-hydroxy-3-[(R)-1-phenyle... | Stable Isotopes | CS-T-97495 | Not Available | Enquire |
| N-Jasmonyl-L-Isoleucine-d3 (Mixture of Diastereomers) | Stable Isotopes | CS-T-96912 | Not Available | Enquire |
| N-tert-Butylcarbamoyl-L-tert-leucine-d9 | Stable Isotopes | CS-T-101761 | Not Available | Enquire |
| N-tert-Butylcarbamoyl-L-tert-leucine-d9 Benzyl Ester | Stable Isotopes | CS-T-101760 | 1795786-80-9 | Enquire |
| (5S,5’S)-Dihydroxy Lysinonorleucine-d4 | Stable Isotopes | CS-T-95105 | Not Available | Enquire |
| (S)-N-Fmoc-L-norleucine-13C6,15N | Stable Isotopes | CS-T-76056 | 1346617-52-4 | Enquire |
| Des-N-(methoxycarbonyl)-L-tert-leucine Atazanavir-d5 Trihydr... | Stable Isotopes | CS-T-73790 | 1246817-28-6 | Enquire |
| Des-N-(methoxycarbonyl)-L-tert-leucine Bis-Boc Atazanavir-d5 | Stable Isotopes | CS-T-73097 | 1217665-60-5 | Enquire |
| L-ALLO-ISOLEUCINE 13C6, 15N | Stable Isotopes | CS-R-00030 | 1509-34-8(Unlabeled) | Enquire |
| L-ISOLEUCINE 13C6 | Stable Isotopes | CS-R-00408 | 201740-82-1 | Enquire |
| L-Isoleucine-d10 | Stable Isotopes | CS-T-93783 | 73-32-5 (Unlabelled) | Enquire |
| L-LEUCINE 13C6 | Stable Isotopes | CS-R-00186 | 201740-84-3 | Enquire |
| L-LEUCINE 13C6, 15N | Stable Isotopes | CS-R-00187 | 202406-52-8 | Enquire |
| L-Leucine D3 | Stable Isotopes | CS-T-57210 | 87828-86-2 | Enquire |
| L-Norleucine-d9 | Stable Isotopes | CS-T-83403 | 1331889-36-1 | Enquire |
| N-Acetyl-L-leucine-N-methylamide-d16 | Stable Isotopes | CS-T-64407 | 1276197-56-8 | Enquire |
| N-Formyl-L-leucine-d3 | Stable Isotopes | CS-T-74850 | 1356930-28-3 | Enquire |
API
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| DL-Norleucine | API | CS-DA-00561 | 616-06-8 | In Stock |
| DL-Isoleucine | API | CS-DK-00008 | 443-79-8 | Enquire |
| Fructose-isoleucine | API | CS-T-55101 | 87304-79-8 | Enquire |
| Fructose-leucine | API | CS-T-55091 | 34393-18-5 | Enquire |
Impurity
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| (2R,3R)-3-Hydroxynorleucine | Impurity | CS-T-78832 | 59286-26-9 | In Stock |
| 6-Oxo DL-Norleucine, Formate Salt | Impurity | CS-O-57880 | 2125941-25-3 | Enquire |
| Alpha-Keto-isoleucine | Impurity | CS-O-14092 | 66393-67-7 | Enquire |
| Des-N-(methoxycarbonyl)-L-tert-leucine Atazanavir impu... | Impurity | CS-O-42976 | Not Available | Enquire |
| Des-N-(methoxycarbonyl)-L-tert-leucine Atazanavir Trihydroch... | Impurity | CS-EC-00092 | 198904-87-9 | Enquire |
| Fmoc-D-Arg(Pbf)-OH | Impurity | CS-U-00012 | 187618-60-6 | In Stock |
| Fmoc-His(Trt)-OH | Impurity | CS-U-00022 | 109425-51-6 | In Stock |
| Fmoc-L-Glu(OtBu)-OH | Impurity | CS-U-00038 | 71989-18-9 | In Stock |
| Isoleucine Valsartan | Impurity | CS-T-29809 | 137862-78-3 | In Stock |
| L-Allo-isoleucine | Impurity | CS-T-64972 | 1509-34-8 | In Stock |
| L-Leucine-ß-naphthylamide | Impurity | CS-T-30974 | 732-85-4 | Enquire |
| L-Norleucine | Impurity | CS-T-37561 | 327-57-1 | In Stock |
| N-ACETYL-DL-ISOLEUCINE | Impurity | CS-O-51687 | 2460646-17-5 | Enquire |
| N-a-Fmoc-L-alanine | Impurity | CS-M-29406 | 35661-39-3 | In Stock |
| (2R,3S)-3-Hydroxynorleucine | Impurity | CS-T-79016 | 59286-25-8 | Enquire |
| (2S,2’S,5S)-5-Hydroxy Lysinonorleucine | Impurity | CS-T-79411 | 869184-38-3 | Enquire |
| (2S,3R)-3-Hydroxynorleucine | Impurity | CS-T-79723 | 10148-69-3 | Enquire |
| (2S,3S)-3-Hydroxynorleucine | Impurity | CS-T-79498 | 10148-68-2 | Enquire |
| 4,5-Dehydro-leucine | Impurity | CS-T-73578 | 87392-13-0 | Enquire |
| 5-Methyl-L-norleucine Orlistat Analogue | Impurity | CS-T-34294 | 1356847-30-7 | Enquire |
| Boc-L-leucine N’-Methoxy-N’-methylamide | Impurity | CS-T-67481 | 87694-50-6 | Enquire |
| Des-Leucine-Vancomycin diformiate salt | Impurity | CS-EK-01768 | 115236-65-2 free base | Enquire |
| D-Isoleucine | Impurity | CS-T-29755 | 319-78-8 | Enquire |
| D-Leucine Methyl Ester Hydrochloride | Impurity | CS-T-30976 | 5845-53-4 | Enquire |
| D-Leucine tert-Butyl Ester Hydrochloride | Impurity | CS-T-30977 | 13081-32-8 | Enquire |
| Fmoc-valine | Impurity | CS-T-24604 | 68858-20-8 | Enquire |
| L-Isoleucine tert-Butyl Ester Hydrochloride | Impurity | CS-T-29753 | 69320-89-4 | Enquire |
| Lopinavir leucine analogue | Impurity | CS-O-50238 | 1132765-60-6 | Enquire |
| Lysino Norleucine | Impurity | CS-T-31390 | 25612-46-8 | Enquire |
| N-Boc-D-isoleucine | Impurity | CS-T-07641 | 55721-65-8 | Enquire |
| N-Boc-D-leucine | Impurity | CS-T-07600 | 16937-99-8 | Enquire |
| N-Carbobenzoxy-dl-norleucine | Impurity | CS-T-69168 | 15027-13-1 | Enquire |
| N-Formyl-L-leucine (3S,4S,6S)-3-Hexyltetrahydro-2-oxo-6-unde... | Impurity | CS-T-74607 | 130676-65-2 | Enquire |
| Ritonavir Isoleucine Analog | Impurity | CS-EO-00619 | Not Available | Enquire |
Intermediate
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| (S)-1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethylamin... | Intermediate | CS-O-13861 | 608141-43-1 | In Stock |
| D-Leucine | Intermediate | CS-T-57211 | 328-38-1 | In Stock |
| Fmoc-D-Pro-OH | Intermediate | CS-BH-00006 | 101555-62-8 | In Stock |
| Fmoc-O-tert-Butyl-D-serine | Intermediate | CS-M-57251 | 128107-47-1 | In Stock |
| L-Leucine Methyl Ester Hydrochloride | Intermediate | CS-O-10821 | 7517-19-3 | In Stock |
| N-Acetyl-D-leucine | Intermediate | CS-M-58019 | 19764-30-8 | In Stock |
| N-Fmoc-D-leucine | Intermediate | CS-T-24563 | 114360-54-2 | In Stock |
| N-Fmoc-L-methionine | Intermediate | CS-T-24553 | 71989-28-1 | In Stock |
| N-methoxycarbonyl-tert-leucine | Intermediate | CS-O-32197 | 162537-11-3 | In Stock |
Fine Chemicals
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 4-Hydroxy-L-isoleucine | Fine Chemicals | CS-M-03320 | 781658-23-9 | In Stock |
| 5-Methyl-L-norleucine | Fine Chemicals | CS-T-34696 | 31872-98-7 | In Stock |
| Dl-alpha-keto isoleucine calcium | Fine Chemicals | CS-O-14818 | 51828-96-7 | In Stock |
| D-tert-Leucine | Fine Chemicals | CS-BW-00065 | 26782-71-8 | In Stock |
| Isoleucine methyl ester | Fine Chemicals | CS-BL-00101 | 2577-46-0 | Enquire |
| L-Methionine | Fine Chemicals | CS-T-32133 | 63-68-3 | In Stock |
| L-tert-Leucine | Fine Chemicals | CS-BW-00066 | 20859-02-3 | In Stock |
| N-formyl-L-leucine (3S, 4S, 6S)-3-hexyl-tetrahydro-2-oxo-6-u... | Fine Chemicals | CS-O-37137 | Not Available | Enquire |
Nitrosamine
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| N-Nitroso Leucine Impurity | Nitrosamine | CS-EO-02604 | 78814-91-2 | Enquire |
| N-Nitroso-N-Methyl-D-Leucine | Nitrosamine | CS-O-52605 | Not Available | Enquire |
Secondary Standards
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Ketoisoleucine sodium salt | Secondary Standards | CS-SS-26525-100MG | 3715-31-9 | Enquire |
| L-Isoleucine | Secondary Standards | CS-SS-24145-1GM | 73-32-5 | Enquire |
| L-Leucine | Secondary Standards | CS-SS-24151-1GM | 61-90-5 | Enquire |
| N-Formyl-L-leucine (3S,4R,6S)-3-hexyl-2-oxo-6-undecyltetrahy... | Secondary Standards | CS-SS-26339-25MG | 130793-27-0 | Enquire |
Stable Isotope Reagent
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| (DL)-tert-D9-Leucine | Stable Isotope Reagent | CS-O-45787 | Not Available | Enquire |
| D-Leucine-1-13C | Stable Isotope Reagent | CS-T-103472 | 82152-60-1 | Enquire |
| Fmoc-[d10]Leu-OH | Stable Isotope Reagent | CS-CH-00119 | 1190594-22-9 | Enquire |
| L-Leucine-d7 (Isopropyl-d7) | Stable Isotope Reagent | CS-C-01182 | 92751-17-2 | In Stock |
| D-Leucine-d10-N-FMOC | Stable Isotope Reagent | CS-C-01391 | 2714483-30-2 | Enquire |
| DL-Leucine-d10 | Stable Isotope Reagent | CS-C-01457 | 29909-01-1 | Enquire |
| DL-Leucine-d10-N-FMOC | Stable Isotope Reagent | CS-C-01021 | 126727-03-5 (Unlabelled) | Enquire |
| DL-Leucine-d7 (iso-propyl-d7) | Stable Isotope Reagent | CS-C-00847 | 259225-40-6 | Enquire |
| Isoleucine-d10 (mixture of diastereomers) | Stable Isotope Reagent | CS-C-01380 | 29909-02-2 | Enquire |
| L-Allo-isoleucine-d10 | Stable Isotope Reagent | CS-T-64865 | 202529-06-4 | Enquire |
| L-Isoleucine-13C6,15N | Stable Isotope Reagent | CS-CH-00102 | 202468-35-7 | Enquire |
| L-Isoleucine-15N | Stable Isotope Reagent | CS-CH-00103 | 59935-30-7 | Enquire |
| L-Isoleucine-15N, N-Fmoc | Stable Isotope Reagent | CS-CH-00104 | 204633-89-6 | Enquire |
| L-Isoleucine-2-d1 | Stable Isotope Reagent | CS-C-00274 | 127290-60-2 | Enquire |
| L-Isoleucine-OH-13C6, 15N, Fmoc | Stable Isotope Reagent | CS-CH-00105 | 1217442-29-9 | Enquire |
| L-Leucine-1-13C | Stable Isotope Reagent | CS-CH-00114 | 74292-94-7 | Enquire |
| L-Leucine-1-13C,15N | Stable Isotope Reagent | CS-CH-00108 | 80134-83-4 | Enquire |
| L-Leucine-13C, N-Fmoc | Stable Isotope Reagent | CS-CH-00107 | 202114-53-2 | Enquire |
| L-Leucine-13C2 | Stable Isotope Reagent | CS-CH-00106 | 134275-63-1 | Enquire |
| L-Leucine-13C6, 15N, N-Fmoc | Stable Isotope Reagent | CS-CH-00109 | 1163133-36-5 | Enquire |
| L-Leucine-13C6, D10 | Stable Isotope Reagent | CS-CH-00110 | 1217445-25-4 | Enquire |
| L-Leucine-15N | Stable Isotope Reagent | CS-CH-00111 | 59935-31-8 | Enquire |
| L-Leucine-15N, N-Boc, Monohydrate | Stable Isotope Reagent | CS-CH-00112 | 13139-15-6(Unlabeled) | Enquire |
| L-Leucine-15N, N-Fmoc | Stable Isotope Reagent | CS-CH-00113 | 200937-57-1 | Enquire |
| L-Leucine-2-13C, 15N | Stable Isotope Reagent | CS-CH-00116 | 285977-88-0 | Enquire |
| L-Leucine-2-d1 | Stable Isotope Reagent | CS-C-01049 | 89836-93-1 | Enquire |
| L-Leucine-3,3-d2 | Stable Isotope Reagent | CS-C-00989 | 362049-59-0 | Enquire |
| L-Leucine-d10-N-t-BOC H2O | Stable Isotope Reagent | CS-C-01472 | 2483831-34-9 | Enquire |
| L-Leucine-d3-N-t-BOC H2O (methyl-d3) | Stable Isotope Reagent | CS-C-00905 | 203645-42-5 | Enquire |
| L-Leucine-d7-N-t-BOC H2O (iso-propyl-d7) | Stable Isotope Reagent | CS-C-00227 | 1159283-32-5 (Free base) | Enquire |
Peptide
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Angiotensin I, 5-L-isoleucine | Peptide | CS-O-48116 | 484-42-4 | Enquire |
| Fmoc-Beta-Ala-L-isoleu-OH | Peptide | CS-O-46361 | 2171270-66-7 | Enquire |
| Fmoc-Beta-Ala-L-Val-OH | Peptide | CS-O-46362 | 2171152-91-1 | Enquire |
| Fmoc-D-Ile-OH | Peptide | CS-T-24561 | 143688-83-9 | Enquire |
| Leucine enkephalin | Peptide | CS-O-57999 | 58822-25-6 | Enquire |
| N-Acetyl-DL-leucine | Peptide | CS-CE-00649 | 99-15-0 | In Stock |
Biochemicals
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| L-Isoleucine for cell culture, 99%, Endotoxin (BET) 1EU/mg | Biochemicals | CS-SR-00511 | 73-32-5 | Enquire |
Building Blocks
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 6-[(3R,4R)-3-(Acetyloxy)-N,4-dimethyl-6-oxo-L-norleucine] Cy... | Building Blocks | CS-T-47131 | 121584-52-9 | Enquire |
| D-Isoleucine benzyl ester 4-toluenesulfonate salt | Building Blocks | CS-O-58227 | 80174-45-4 | Enquire |
| D-N-Methylleucine | Building Blocks | CS-O-52052 | 31321-74-1 | Enquire |
| Fmoc-D-Tic-OH | Building Blocks | CS-T-77477 | 130309-33-0 | In Stock |
| Fmoc-L-2-thienylalanine | Building Blocks | CS-T-75428 | 130309-35-2 | In Stock |
| Fmoc-L-Ala-ethyl ester | Building Blocks | CS-O-43146 | 117402-82-1 | Enquire |
| Fmoc-L-Alanine Isopropyl ester | Building Blocks | CS-O-43148 | 1185984-34-2 | Enquire |
| Fmoc-L-Ala-tert-butyl ester | Building Blocks | CS-O-43147 | 71953-00-9 | Enquire |
| L-Isoleucine | Building Blocks | CS-O-30624 | 73-32-5 | In Stock |
| L-Leucine | Building Blocks | CS-T-30972 | 61-90-5 | In Stock |
| L-Photo-leucine | Building Blocks | CS-O-57448 | 851960-91-3 | Enquire |
| N-(Methoxycarbonyl)-D-tert-leucine | Building Blocks | CS-T-102290 | 1191091-65-2 | Enquire |
| N-Acetyl-L-leucine | Building Blocks | CS-M-10436 | 1188-21-2 | In Stock |
| N-Formyl-L-leucine | Building Blocks | CS-M-35592 | 6113-61-7 | In Stock |
| 5,5,5-Trifluoro-DL-leucine | Building Blocks | CS-M-01480 | 2792-72-5 | Enquire |
| Ac-4,5-dehydro-L-leucine | Building Blocks | CS-N-00313 | 88547-24-4 | Enquire |
| Boc-5,5,5-trifluoro-DL-leucine | Building Blocks | CS-M-29465 | 409333-67-1 | Enquire |
| Boc-a-methyl-DL-leucine | Building Blocks | CS-M-29468 | 97534-52-6 | Enquire |
| Boc-L-ß-homoleucine | Building Blocks | CS-M-30030 | 132549-43-0 | Enquire |
| Boc-N-methyl-L-leucine | Building Blocks | CS-AC-04915 | 53363-89-6 | Enquire |
| Cbz-L-tert-Leucine | Building Blocks | CS-T-70013 | 62965-10-0 | Enquire |
| Dansyl-L-leucine Cyclohexylammonium Salt | Building Blocks | CS-T-73649 | 42954-58-5 | Enquire |
| D-Isoleucine Methyl Ester Hydrochloride | Building Blocks | CS-TB-75569 | 167223-42-9 | Enquire |
| DL-2-(Trifluoromethyl)leucine | Building Blocks | CS-CE-00200 | 136030-50-7 | Enquire |
| Fmoc-Ala-Ome | Building Blocks | CS-T-94713 | 146346-88-5 | Enquire |
| Fmoc-5,5,5-trifluoro-DL-leucine | Building Blocks | CS-M-29486 | 777946-04-0 | Enquire |
| Fmoc-a-methyl-DL-leucine | Building Blocks | CS-M-29504 | 678992-19-3 | Enquire |
| Fmoc-DL-ß-leucine | Building Blocks | CS-M-30091 | 282524-93-0 | Enquire |
| Fmoc-l-beta-homoisoleucine | Building Blocks | CS-T-77828 | 193954-27-7 | Enquire |
| Fmoc-l-norleucine n-hydroxysuccinimide ester | Building Blocks | CS-T-75314 | 201026-08-6 | Enquire |
| Fmoc-L-ß-homoleucine | Building Blocks | CS-M-30093 | 193887-44-4 | Enquire |
| Fmoc-ß -alanine | Building Blocks | CS-M-30089 | 35737-10-1 | Enquire |
| N-2-Naphthalenyl-L-leucine | Building Blocks | CS-T-59136 | 99631-79-5 | Enquire |
| N-Carbobenzoxy-d-leucine dicyclohexylammonium salt | Building Blocks | CS-T-71501 | 7662-58-0 | Enquire |
| N-Cbz-D-isoleucine | Building Blocks | CS-T-71099 | 28862-89-7 | Enquire |
| N-Cbz-L-isoleucine | Building Blocks | CS-T-10677 | 3160-59-6 | Enquire |
| N-Cbz-L-leucine | Building Blocks | CS-T-10682 | 2018-66-8 | Enquire |
| N-Fmoc-5,5,5,5’,5’,5’-Hexafluoro-L-leucine | Building Blocks | CS-T-76400 | 918667-71-7 | Enquire |
| N-Glycyl-l-isoleucine | Building Blocks | CS-T-78596 | 19461-38-2 | Enquire |
| N-tert-Butylcarbamoyl-L-tert-leucine | Building Blocks | CS-T-09377 | 101968-85-8 | Enquire |
Deuterated Reagents
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| L-Leucine-d10 | Deuterated Reagents | CS-C-00491 | 106972-44-5 | In Stock |
| D-Leucine-d10 | Deuterated Reagents | CS-O-34335 | 271247-12-2 | Enquire |