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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.

Leucine Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"(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
D-Leucine-d10 Hydrochloride Stable Isotopes CS-O-59131 271247-12-2 (Free salt) Enquire
DL-Leucine-d10 Stable Isotopes CS-C-01457 29909-01-1 Enquire
L-ALLO-ISOLEUCINE 13C6, 15N Stable Isotopes CS-R-00030 1509-34-8(Unlabeled) Enquire
L-Allo-isoleucine-d10 Stable Isotopes CS-T-64865 202529-06-4 Enquire
L-ISOLEUCINE 13C6 Stable Isotopes CS-R-00408 201740-82-1 Enquire
L-Isoleucine-[13C6] Stable Isotopes CS-I-00659 201740-82-1 Enquire
L-Isoleucine-13C6,15N Stable Isotopes CS-CH-00102 202468-35-7 Enquire
L-Isoleucine-15N Stable Isotopes CS-CH-00103 59935-30-7 Enquire
L-Isoleucine-15N, N-Fmoc Stable Isotopes CS-CH-00104 204633-89-6 Enquire
L-Isoleucine-2-d1 Stable Isotopes CS-C-00274 127290-60-2 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-Leucine-1-13C Stable Isotopes CS-CH-00114 74292-94-7 Enquire
L-Leucine-1-13C,15N Stable Isotopes CS-CH-00108 80134-83-4 Enquire
L-Leucine-13C, N-Fmoc Stable Isotopes CS-CH-00107 202114-53-2 Enquire
L-Leucine-13C2 Stable Isotopes CS-CH-00106 134275-63-1 Enquire
L-Leucine-15N Stable Isotopes CS-CH-00111 59935-31-8 Enquire
L-Leucine-15N, N-Boc, Monohydrate Stable Isotopes CS-CH-00112 13139-15-6(Unlabeled) Enquire
L-Leucine-15N, N-Fmoc Stable Isotopes CS-CH-00113 200937-57-1 Enquire
L-Leucine-2-13C, 15N Stable Isotopes CS-CH-00116 285977-88-0 Enquire
L-Leucine-d10 Hydrochloride Stable Isotopes CS-O-59130 106972-44-5 (free salt) Enquire
L-Leucine-d7-N-t-BOC H2O (iso-propyl-d7) Stable Isotopes CS-C-00227 1159283-32-5 (Free base) Enquire
L-Norleucine-d9 Stable Isotopes CS-T-83403 1331889-36-1 Enquire
N-[(+)-Isojasmonoyl]-(S)-isoleucine-15N Stable Isotopes CS-T-96917 Not Available Enquire
N-Acetyl-L-leucine-N-methylamide-d16 Stable Isotopes CS-T-64407 1276197-56-8 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-Formyl-L-leucine-d3 Stable Isotopes CS-T-74850 1356930-28-3 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


API Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
DL-Isoleucine API Standards CS-DK-00008 443-79-8 Enquire
DL-Norleucine API Standards CS-DA-00561 616-06-8 In Stock
Fructose-isoleucine API Standards CS-T-55101 87304-79-8 Enquire
Fructose-leucine API Standards CS-T-55091 34393-18-5 Enquire


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"(2S,3R)-3-Hydroxynorleucine" Impurities CS-T-79723 10148-69-3 Enquire
(2R,3R)-3-Hydroxynorleucine Impurities CS-T-78832 59286-26-9 In Stock
(2R,3S)-3-Hydroxynorleucine Impurities CS-T-79016 59286-25-8 Enquire
(2S,2’S,5S)-5-Hydroxy Lysinonorleucine Impurities CS-T-79411 869184-38-3 Enquire
(2S,3S)-3-Hydroxynorleucine Impurities CS-T-79498 10148-68-2 Enquire
4,5-Dehydro-leucine Impurities CS-T-73578 87392-13-0 Enquire
5-Methyl-L-norleucine Orlistat Analogue Impurities CS-T-34294 1356847-30-7 Enquire
6-Oxo DL-Norleucine, Formate Salt Impurities CS-O-57880 2125941-25-3 Enquire
Allysine Impurities CS-T-84279 1962-83-0 Enquire
Alpha-Keto-isoleucine Impurities CS-O-14092 66393-67-7 Enquire
Boc-L-leucine N’-Methoxy-N’-methylamide Impurities CS-T-67481 87694-50-6 Enquire
D-Alloisoleucine Impurities A070163 1509-35-9 Enquire
Des-Leucine-Vancomycin diformiate salt Impurities CS-EK-01768 115236-65-2 free base Enquire
Des-N-(methoxycarbonyl)-L-tert-leucine Atazanavir Trihydroch... Impurities CS-EC-00092 198904-87-9 Enquire
D-Isoleucine Impurities CS-T-29755 319-78-8 Enquire
D-Leucine Methyl Ester Hydrochloride Impurities CS-T-30976 5845-53-4 Enquire
D-Leucine tert-Butyl Ester Hydrochloride Impurities CS-T-30977 13081-32-8 Enquire
Isoleucine Valsartan Impurities CS-T-29809 137862-78-3 In Stock
L-Allo-isoleucine Impurities CS-T-64972 1509-34-8 In Stock
L-Isoleucine tert-Butyl Ester Hydrochloride Impurities CS-T-29753 69320-89-4 Enquire
L-Leucine-ß-naphthylamide Impurities CS-T-30974 732-85-4 Enquire
L-Norleucine Impurities CS-T-37561 327-57-1 In Stock
Lysino Norleucine Impurities CS-T-31390 25612-46-8 Enquire
N-ACETYL-DL-ISOLEUCINE Impurities CS-O-51687 2460646-17-5 Enquire
N-Boc-D-isoleucine Impurities CS-T-07641 55721-65-8 Enquire
N-Boc-D-leucine Impurities CS-T-07600 16937-99-8 Enquire
N-Carbobenzoxy-dl-norleucine Impurities CS-T-69168 15027-13-1 Enquire
N-Formyl-L-leucine (3S,4S,6S)-3-Hexyltetrahydro-2-oxo-6-unde... Impurities CS-T-74607 130676-65-2 Enquire
N-Nitroso Leucine Impurity Impurities CS-EO-02604 78814-91-2 Enquire
Ritonavir Isoleucine Analog Impurities CS-EO-00619 Not Available Enquire


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"(2R,3S)-β-Hydroxyleucine" Intermediates CS-T-56115 87421-23-6 Enquire
"(5S,5'S)-Dihydroxy Lysinonorleucine" Intermediates CS-T-19193 32619-23-1 Enquire
"N-Methyl-l-isoleucine, HCl" Intermediates CS-AC-08466 66866-68-0 Enquire
((2,5-Dimethylphenyl)sulfonyl)leucine Intermediates CS-ED-18166 1009793-82-1 Enquire
((2-Fluorophenyl)sulfonyl)leucine Intermediates CS-ED-29493 1041437-98-2 Enquire
((4-(2-Methoxyphenoxy)phenyl)sulfonyl)leucine Intermediates CS-ED-31762 1008647-74-2 Enquire
((4-(o-Tolyloxy)phenyl)sulfonyl)leucine Intermediates CS-ED-32580 1008956-66-8 Enquire
(2S,2’S,5R)-5-Hydroxy Lysinonorleucine Hydrochloride Intermediates CS-T-27622 869184-37-2 Enquire
(2S,2’S,5S)-5-Hydroxy Lysinonorleucine Hydrochloride Intermediates CS-T-27623 869111-61-5 Enquire
(2S,3R)-β-Hydroxyleucine Intermediates CS-T-56021 10148-71-7 Enquire
(2S,3R)-ß-Hydroxyleucine Hydrochloride Intermediates CS-T-78127 1598376-94-3 Enquire
(5R,5'R)-Dihydroxy Lysinonorleucine Intermediates CS-T-19194 869111-52-4 Enquire
(5S,5'R)-Dihydroxy Lysinonorleucine Intermediates CS-T-19195 869111-63-7 Enquire
(L-Leucinethiol)2 · 2 HCl Intermediates CS-AX-00188 112157-33-2 Enquire
(S)-1-(3-ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethylamin... Intermediates CS-O-13861 608141-43-1 In Stock
(S)-a--Methylleucine Intermediates CS-DV-00425 105743-53-1 Enquire
(S)-N-Boc-leucine-nitrile Intermediates CS-ED-13425 115654-61-0 Enquire
4-Hydroxyisoleucine Intermediates CS-AF-00031 55399-93-4 Enquire
Acetyl-L-isoleucine methyl amide Intermediates CS-ED-35691 32483-16-2 Enquire
Allenic Norleucine Intermediates CS-T-65315 18751-91-2 Enquire
Arginyl-Leucine Intermediates CS-ED-40050 1188-24-5 Enquire
beta-Hydroxyleucine Intermediates CS-ED-40841 10148-70-6 Enquire
Boc-DL-ß-leucine Intermediates CS-M-30028 248924-39-2 Enquire
Boc-l-6-hydroxynorleucine Intermediates CS-T-68075 77611-37-1 Enquire
Boc-l-beta-homoisoleucine Intermediates CS-AC-03229 218608-82-3 Enquire
Boc-L-Isoleucine Intermediates CS-M-57581 13139-16-7 Enquire
Boc-N-methyl-D-leucine Intermediates CS-AC-02331 89536-84-5 Enquire
Boc-N-methyl-L-isoleucine Intermediates CS-AC-03291 52498-32-5 Enquire
Camphorquinone-10-sulfonylnorleucine Intermediates CS-T-50222 73413-80-6 Enquire
Cbz-D-allo-isoleucine Intermediates CS-ED-05955 55723-45-0 Enquire
Cycloleucine Methyl Ester.HCl Intermediates CS-BP-00039 60421-23-0 Enquire
D-Alloisoleucine Intermediates CS-AC-02592 1509-35-9 Enquire
Des-N-(methoxycarbonyl)-L-tert-leucine Bis-Boc Atazanavir Intermediates CS-T-52182 198904-86-8 Enquire
DL-6-Hydroxy Norleucine Intermediates CS-T-28121 305-77-1 Enquire
dl-Alanyl-dl-isoleucine Intermediates CS-ED-25743 935399-25-0 Enquire
D-Leucine Intermediates CS-T-57211 328-38-1 In Stock
DL-Leucine Intermediates CS-M-57822 328-39-2 Enquire
DL-Norleucine methyl ester, HCl Intermediates CS-T-82869 77300-48-2 Enquire
Dl-norleucineamide Intermediates CS-T-83427 4748-00-9 Enquire
Dl-tert-leucine Intermediates CS-AC-04738 33105-81-6 Enquire
D-Norleucine Intermediates A070045 327-56-0 Enquire
Fmoc-D-homoleucine Intermediates CS-T-74587 204320-60-5 Enquire
Glycyl-alanyl-leucine Intermediates CS-ED-40619 22849-49-6 Enquire
Glycylglycyl-l-isoleucine Intermediates CS-T-79746 69242-40-6 Enquire
Histidylleucine Intermediates CS-ED-11125 7763-65-7 Enquire
Indole-3-acetyl-L-isoleucine Intermediates CS-CE-00759 57105-45-0 Enquire
Indole-3-acetyl-L-leucine Intermediates CS-CE-00760 36838-63-8 Enquire
L-6-Hydroxy Norleucine Intermediates CS-T-28122 6033-32-5 Enquire
l-Alanyl-l-leucine Intermediates CS-ED-02594 3303-34-2 Enquire
L-beta-Homoisoleucine Hydrochloride Intermediates CS-T-79051 219310-10-8 Enquire
L-Beta-homoleucine, HCl Intermediates CS-AC-04589 96386-92-4 Enquire
L-Leucine 7-amido-4-methylcoumarin hydrochloride salt Intermediates CS-CE-00695 62480-44-8 Enquire
L-Leucine chloromethyl ketone HCl Intermediates CS-AC-02774 54518-92-2 Enquire
L-Leucine ethyl ester HCl Intermediates CS-AC-02289 2743-40-0 Enquire
L-Leucine Methyl Ester Hydrochloride Intermediates CS-O-10821 7517-19-3 In Stock
L-leucyl-L-isoleucine Intermediates CS-ED-12356 36077-41-5 Enquire
L-tert-Leucine methyl ester hydrochloride Intermediates CS-O-32373 63038-27-7 Enquire
N-(3,3-Dimethyl-3,4-dihydroisoquinolin-1-yl)leucine Intermediates CS-M-06424 537049-20-0 Enquire
N-(Benzyloxycarbonyl)-D-leucine Intermediates CS-T-48991 28862-79-5 Enquire
N-[(4-Methylphenyl)sulfonyl]-L-leucine 4-Methyl-2-oxo-2H-1-b... Intermediates CS-T-82607 152061-78-4 Enquire
N-[tert-Butyloxycarbonyl]-6-hydroxy-DL-norleucine Intermediates CS-T-09855 81505-64-8 Enquire
N-2-Nitrophenylsulfenyl-L-isoleucine Dicyclohexylammonium Sa... Intermediates CS-ED-32443 10382-52-2 Enquire
N-Acetyl-D-leucine Intermediates CS-M-58019 19764-30-8 In Stock
N-Acetyl-DL-leucine Intermediates CS-CE-00649 99-15-0 In Stock
N-Acetyl-DL-norleucine Intermediates CS-AC-03057 7682-16-8 Enquire
N-Acetyl-L-leucine-p-nitroanilide Intermediates CS-ED-38072 19746-40-8 Enquire
N-alpha-Formyl-D-leucine Intermediates CS-ED-40629 44978-39-4 Enquire
N-Benzyl-N-methyl-isoleucine Intermediates CS-T-68784 4125-97-7 Enquire
N-Carbobenzoxy-dl-leucine Intermediates CS-T-71402 3588-60-1 Enquire
N-Carboxyleucine Anhydride Intermediates CS-T-70475 3190-70-3 Enquire
N-Cbz-N-methyl-L-leucine Intermediates CS-AC-03374 33099-08-0 Enquire
N-Fmoc-D-leucine Intermediates CS-T-24563 114360-54-2 In Stock
N-Fmoc-L-isoleucine Intermediates CS-T-24562 71989-23-6 In Stock
N-Me-L-norleucine HCl Intermediates CS-T-80325 17343-27-0 Enquire
N-methoxycarbonyl-tert-leucine Intermediates CS-O-32197 162537-11-3 In Stock
N-Methyl-L-leucine Intermediates CS-AC-09287 3060-46-6 Enquire
N-Methyl-L-leucine HCl Intermediates CS-AC-09124 66866-69-1 Enquire
Tyrosylleucine Intermediates CS-ED-11216 17355-10-1 Enquire


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-tert-Leucine Fine Chemicals CS-BW-00066 20859-02-3 In Stock


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"Ac-4,5-dehydro-L-leucine" Building Blocks CS-N-00313 88547-24-4 Enquire
"Fmoc-5,5,5-trifluoro-DL-leucine" Building Blocks CS-M-29486 777946-04-0 Enquire
"N-Fmoc-5,5,5,5’,5’,5’-Hexafluoro-L-leucine" Building Blocks CS-T-76400 918667-71-7 Enquire
5,5,5-Trifluoro-DL-leucine Building Blocks CS-M-01480 2792-72-5 Enquire
6-[(3R,4R)-3-(Acetyloxy)-N,4-dimethyl-6-oxo-L-norleucine] Cy... Building Blocks CS-T-47131 121584-52-9 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 benzyl ester 4-toluenesulfonate salt Building Blocks CS-O-58227 80174-45-4 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
D-N-Methylleucine Building Blocks CS-O-52052 31321-74-1 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
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)-L-tert-leucine Building Blocks CS-T-32268 162537-11-3 Enquire
N-2-Naphthalenyl-L-leucine Building Blocks CS-T-59136 99631-79-5 Enquire
N-Acetyl-L-leucine Building Blocks CS-M-10436 1188-21-2 In Stock
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-Formyl-L-leucine Building Blocks CS-M-35592 6113-61-7 In Stock
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