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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Guanidine, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Guanidine 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 Guanidine-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.

Guanidine Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"[13C,15N3]-Acetylguanidine" Stable Isotopes CS-EK-01780 5699-40-1 unlabeled Enquire
"2,3-Dichlorobenzamidyl Guanidine 13C2" Stable Isotopes CS-T-52561 1185047-08-8 Enquire
"Acetylguanidine 13C,15N3" Stable Isotopes CS-CX-00343 5699-40-1 Enquire
1-(4-Bromomethyl-2-thiazoyl)guanidine 13C3, Hydrobromide Sal... Stable Isotopes CS-T-49536 1329835-03-1 (Freebase) Enquire
1-(4-Chloromethyl-2-thiazoyl)guanidine-13C3 Hydrochloride Sa... Stable Isotopes CS-T-72348 1189443-23-9 Enquire
1-(4-Cyclopropyl-6-methylpyrimidin-2-yl)-3-phenylguanidine-1... Stable Isotopes CS-T-102372 Not Available Enquire
1,1-Dimethyl-d6-2,3-bis(tert-butyloxycarbonyl)guanidine Stable Isotopes CS-T-101494 Not Available Enquire
4-Aminobutyl-d8 Guanidine Dihydrochloride Stable Isotopes CS-T-97044 Not Available Enquire
4-Aminobutyl-d8 Guanidine Tri-tert-butyl Ester Stable Isotopes CS-T-97043 Not Available Enquire
Aminoguanidine hemisulfate 13C,15N4 Stable Isotopes CS-CX-00360 478189-68-3 (Freebase) Enquire
Guanidine-15N3 Hydrobromide Stable Isotopes CS-T-100256 Not Available Enquire
Guanidine-15N3 Hydrochloride Stable Isotopes CS-T-78021 121616-39-5 Enquire
Guanidine-d5 Hydrochloride-d Stable Isotopes CS-T-55461 108694-93-5 In Stock
N,N'-Diphenylguanidine-d10 Stable Isotopes CS-T-100418 Not Available Enquire
N-Methylguanidine D3 Stable Isotopes CS-T-58812 1020719-65-6 Enquire
N-Methylguanidine-d3 Hydrochloride Stable Isotopes CS-T-58246 1246820-23-4 Enquire
Phenylguanidine Nitrate-d5 Stable Isotopes CS-T-99885 Not Available Enquire
Sulfaguanidine-D4 Stable Isotopes CS-T-94033 57-67-0 unlabelled Enquire


API Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Acetylsulfaguanidine API Standards CS-O-36716 19077-97-5 Enquire
Aminoguanidine Nitrate API Standards CS-T-02678 10308-82-4 Enquire
Guanidine acetate API Standards CS-ED-00988 593-87-3 Enquire
Guanidine Phosphate API Standards CS-O-16591 Not Available Enquire
Hydroxyguanidine API Standards CS-T-78864 13115-21-4 Enquire
Sulfaguanidine API Standards CS-O-11748 57-67-0 In Stock
Sulfaguanidine monohydrate API Standards CS-K-00257 6190-55-2 Enquire


Metabolites

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1,1-Dimethyl-2,3-bis(tert-butyloxycarbonyl)guanidine Metabolites CS-T-91878 215170-99-3 Enquire


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"N-[(6-Chloro-3-pyridinyl)methyl]-N-(2,2-diethoxyethyl)-N’-n... Impurities CS-T-72267 155802-59-8 Enquire
"N-1,3-Benzoxazol-2-ylguanidine" Impurities CS-M-25435 39123-82-5 Enquire
1-(4-(chloromethyl)-4-hydroxy-4,5-dihydrothiazol-2-yl)guanid... Impurities CS-ED-02047 95907-34-9 Enquire
1-Cyano-3-isopropylguanidine Impurities CS-T-13536 44830-55-9 Enquire
1-β-D-Ribofuranosyl-3-aminocarbonyl guanidine Impurities CS-O-13992 Not Available Enquire
1-β-D-Ribofuranosyl-3-iminohydroxymethyl guanidine Impurities CS-O-13993 Not Available Enquire
2-(4-(CHLOROMETHYL)-4-HYDROXY-2-THIAZOLIN-2-YL)GUANIDINE HYD... Impurities CS-O-44556 95907-33-8 Enquire
2-(5-(chloromethyl)thiazol-2-yl)guanidine Impurities CS-O-44898 1378820-83-7 Enquire
Adrenochrome Monoaminoguanidine Mesilate Impurities CS-T-01417 4009-68-1 Enquire
N-​Cyano-​N',​N''-​dimethylguanidine Impurities CS-T-89515 1609-06-9 Enquire
N-1H-Benzimidazol-2-ylguanidine Impurities CS-M-47140 5418-95-1 Enquire
N-Formylguanidine Impurities CS-T-76958 4471-51-6 Enquire
Nitrosoguanidine Impurities CS-ED-01250 674-81-7 Enquire
N-Methylguanidine Hydrochloride Impurities CS-T-33922 21770-81-0 Enquire
N-Methyl-N-nitro-N′-nitrosoguanidine Impurities CS-O-45793 26305-08-8 Enquire


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"1,1-dimethylguanidine hydrochloride" Intermediates CS-EL-00976 22583-29-5 Enquire
"1,3-Diphenylguanidine Hydrobromide" Intermediates CS-DJ-00379 93982-96-8 Enquire
"2-tert-Butyl-1,1,3,3-tetramethylguanidine" Intermediates CS-T-69894 29166-72-1 Enquire
"4-N-2,2-Diethoxyethylguanidine-5-chloro-2,1,3-benzothiadiaz... Intermediates CS-T-90723 1391053-77-2 Enquire
"acetic acid; 1,1-diethylguanidine" Intermediates CS-EL-00743 1208081-42-8 Enquire
"Carbamoyl-guanidine Amidino Urea Salt, Hydrochloride salt" Intermediates CS-T-10204 926-72-7 Enquire
"N-(3,4-Dimethylphenyl)-N-[hydrazino(imino)-methyl]guanidine... Intermediates CS-M-34672 1171647-17-8 Enquire
"N,N'-Di-boc-guanidine" Intermediates CS-AC-04096 154476-57-0 Enquire
1-​(2-​Mercaptoethyl)​guanidine Sulfate Intermediates CS-T-82334 3979-00-8 Enquire
1-(2-methyl-5-nitrophenyl)guanidine nitrate Intermediates CS-O-31504 152460-08-7 Enquire
1-(4-(2-Methoxyphenyl)thiazol-2-yl)guanidine Hydrobromide Intermediates CS-T-82626 123310-81-6 Enquire
1-(4-(3-Bromophenyl)thiazol-2-yl)guanidine hydrobromide Intermediates CS-ED-21757 1006032-17-2 Enquire
1-(4-(3-Chlorophenyl)thiazol-2-yl)guanidine Hydrobromide Intermediates CS-T-72374 123310-66-7 Enquire
1-(4-(4-Methoxyphenyl)thiazol-2-yl)guanidine Hydrobromide Intermediates CS-T-80868 96996-05-3 Enquire
1-(4,5-Dimethyl-1,3-thiazol-2-yl)guanidine hydrobromide Intermediates CS-M-43969 85207-84-7 Enquire
1-(4-Chloromethyl-2-thiazoyl)guanidine Hydrochloride Salt Intermediates CS-T-50847 69014-12-6 In Stock
1-(4-cyanophenyl) guanidine Intermediates CS-O-32045 373690-68-7 Enquire
1-(4-cyanophenyl)guanidine nitrate Intermediates CS-EL-03990 5637-41-2 Enquire
1-(4-Phenoxyphenyl)guanidine nitrate Intermediates CS-ED-32863 105901-53-9 Enquire
1-(Benzylideneamino)-1-methylguanidine;hydroiodide Intermediates CS-ED-13092 113712-70-2 Enquire
1-(Pyrimidin-2-yl)guanidine Intermediates CS-ED-33676 90585-97-0 Enquire
1,1,3,3-Tetramethylguanidine Intermediates CS-T-61937 80-70-6 In Stock
1,3-Diaminoguanidine hydrochloride Intermediates CS-MM-09830 36062-19-8 In Stock
1,3-Di-boc-2-(carboxymethyl)guanidine Intermediates CS-T-88878 158478-76-3 Enquire
1,3-Di-Boc-2-(trifluoromethylsulfonyl)guanidine Intermediates CS-T-88538 207857-15-6 Enquire
1,3-Diphenylguanidine Intermediates CS-ED-26773 102-06-7 In Stock
1-[Amino(4-methylpiperazin-1-yl)methylidene]guanidine dihydr... Intermediates CS-ED-11079 18413-36-0 Enquire
1-Amino-2-methyl-3-phenylguanidine hydroiodide Intermediates CS-ED-06186 1086225-97-9 Enquire
1-Amino-3-(2,6-dimethylphenyl)guanidine hydroiodide Intermediates CS-ED-05920 68569-67-5 Enquire
1-Cyano-2-ethylguanidine Intermediates CS-ED-07177 24010-80-8 Enquire
1-Methyl-3-((tetrahydrofuran-3-yl)methyl)guanidine hydrochlo... Intermediates CS-ED-27222 939773-22-5 Enquire
1-Methyl-3-nitroguanidine Intermediates CS-BX-00482 4245-76-5 Enquire
2-(3-Hydroxybenzyl)guanidine Intermediates CS-O-49768 78406-89-0 Enquire
2,6-dichlorophenylguanidine Intermediates CS-ED-00439 39075-78-0 Enquire
2-[(2-Nitrophenyl)methylideneamino]guanidine Intermediates CS-ED-32313 102632-31-5 Enquire
2-[4-[[(E)-3-(4-fluorophenyl)-3-oxoprop-1-enyl]amino]phenyl]... Intermediates CS-ED-36504 423742-56-7 Enquire
2-Amino-1,1-dimethylguanidine hydroiodide Intermediates CS-ED-05645 33398-73-1 Enquire
2-Amino-1,3-dimethylguanidine hydroiodide Intermediates CS-ED-05644 71440-83-0 Enquire
2-Methyl-4-nitrophenylguanidine Nitrate Intermediates CS-T-34599 796738-73-3 Enquire
3-Amino-1,1,3-trimethylguanidine hydroiodide Intermediates CS-ED-11007 1803611-28-0 Enquire
3-Nitrophenylguanidine Nitrate Intermediates CS-T-37047 142992-99-2 Enquire
3-Phenyl-1-aminoguanidine hydroiodide Intermediates CS-ED-11157 56204-41-2 Enquire
4-Chlorophenylguanidine hydrochloride Intermediates CS-T-72854 14279-91-5 Enquire
Aminoguanidine sulfate Intermediates CS-ED-05378 1068-42-4 Enquire
Cyanoacetyl Guanidine Intermediates CS-T-51345 55034-35-0 Enquire
Cyanoguanidine oxalate Intermediates CS-CD-00166 15895-49-5 Enquire
Guanidine Hydrobromide Intermediates CS-T-25725 19244-98-5 Enquire
Guanidine thiocyanate Intermediates CS-DA-00580 593-84-0 Enquire
Guanidine, [4-(mercaptomethyl)-2-thiazolyl]- Intermediates CS-ED-34293 95853-51-3 Enquire
Guanidine, N-cyano-N'-(1-methylethyl)-N''-3-pyridinyl- Intermediates CS-ED-07600 67026-34-0 Enquire
N-(2-fluorobenzyl)-N-methylguanidine Intermediates CS-ED-30003 915919-83-4 Enquire
N-(3,5-Dimethylphenyl)-N'-[2-(trifluoromethyl)phenyl]-guanid... Intermediates CS-ED-12486 1430208-73-3 Enquire
N-(3-Methoxy-phenyl)-guanidine Intermediates CS-AC-04000 57004-60-1 Enquire
N-(4-Chlorobenzyl)-N-methylguanidine Intermediates CS-ED-08092 46232-80-8 Enquire
N-(4-Cyanophenyl)guanidine Intermediates CS-T-51379 5637-42-3 Enquire
N-(4-Cyanophenyl)guanidine hydrochloride Intermediates CS-O-31974 373690-68-7 Enquire
N-(4-Diethylaminobenzylideneamino)guanidine Acetic Acid Salt Intermediates CS-T-18076 1185244-51-2 Enquire
N-(5-chloro-2,1,3-benzothiadiazol-4-yl)-guanidine Intermediates CS-T-72004 125292-37-7 Enquire
N-(5-Hydroxypentyl)guanidine hydrochloride Intermediates CS-ED-40838 1049737-97-4 Enquire
N-(cyclohexylmethyl)guanidine hydrobromide Intermediates CS-ED-07858 2060008-70-8 Enquire
N,N'-Bis(benzyloxycarbonyl)guanidine Intermediates CS-ED-21855 10065-79-9 Enquire
N-[(2-chloro-5-thiazolyl)methyl]-N'-nitro-Guanidine Intermediates CS-ED-00443 135018-15-4 Enquire
N-[2-[(6-Amino-5-nitro-2-pyridinyl)amino]ethyl]guanidine Hyd... Intermediates CS-T-47960 1246816-36-3 Enquire
N-[3-(Hydroxymethyl)phenyl]guanidine Intermediates CS-T-79715 437384-34-4 Enquire
N-[4-(Aminomethyl)phenyl]guanidine Dihydrochloride Intermediates CS-T-66572 202979-33-7 Enquire
N-Cyano-N’-(1,1-dimethylpropyl)-N’’-3-pyridinyl-guanidine Intermediates CS-T-73627 60559-98-0 Enquire
p-Chlorophenylcyanoguanidine Intermediates CS-T-50917 1482-62-8 Enquire
p-Chlorophenylguanidine Intermediates CS-T-50918 45964-97-4 Enquire
Phenylguanidine nitrate Intermediates CS-M-43669 18860-78-1 Enquire
Polyhexamethyleneguanidine phosphate Intermediates CS-O-45246 89697-78-9 Enquire
tetramethylguanidine dihydrogen phosphate Intermediates CS-CA-00362 287481-42-9 Enquire
Tricyclohexylguanidine Intermediates CS-T-87166 4833-41-4 Enquire


Glucuronides

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N1-Beta-D-Galactopyranosylamino-guanidine Hydrochloride Glucuronides CS-N-00092 109853-84-1 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1,2,3-Triisopropylguanidine Fine Chemicals CS-O-36903 121948-77-4 Enquire
1,3-Di-o-tolylguanidine Fine Chemicals CS-ZG-32340 97-39-2 Enquire
1-methyl-1-nitro-guanidine Fine Chemicals CS-ED-00281 62409-38-5 Enquire
2-(4-(CHLOROMETHYL)THIAZOL-2-YL)GUANIDINE Fine Chemicals CS-ZG-14990 81152-53-6 Enquire
Aminoguanidine (hydrochloride) Fine Chemicals CS-ZE-24901 1937-19-5 In Stock
Aminoguanidine sulfate monohydrate Fine Chemicals CS-MM-04064 996-19-0 Enquire
Ethylene Guanidine Fine Chemicals CS-T-22071 26893-38-9 Enquire
Guanidine carbonate Fine Chemicals CS-DB-00091 593-85-1 Enquire
Guanidine Hydrochloride Fine Chemicals CS-O-11663 50-01-1 In Stock
Guanidine Nitrate Fine Chemicals CS-T-25727 506-93-4 In Stock
N-(2-Hydroxyethyl)guanidine hydrochloride Fine Chemicals CS-MM-06324 63885-25-6 Enquire
N-Cyano-N′-[4-(4-morpholinyl)phenyl]guanidine Fine Chemicals CS-O-54942 454646-55-0 Enquire
N-Nitroguanidine Fine Chemicals CS-M-42980 556-88-7 In Stock
Polyhexamethyleneguanidine Fine Chemicals CS-ZH-20573 57028-96-3 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Aminoguanidine Hydrochloride Building Blocks CS-CA-00431 16139-18-7 In Stock