Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Urea, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Urea 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 Urea-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 Urea-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.
Urea Related Compounds
Stable Isotopes
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 1-(2-(Benzyloxy)-5-(2-(tert-butylamino)acetyl)phenyl)urea-d9... | Stable Isotopes | CS-T-98933 | Not Available | Enquire |
| 1-(2-Aminoethyl-d4)-3-(5-chlorobenzo[c][1,2,5]thiadiazol-4-y... | Stable Isotopes | CS-T-100877 | Not Available | Enquire |
| 1-(2-bromo-6-fluorophenyl)-3-(2-(methoxy-d3)-5-(trifluoromet... | Stable Isotopes | CS-O-48627 | 1961287-68-2 | In Stock |
| 1,3-Diethyl-1,3-diphenylurea-d10 | Stable Isotopes | CS-T-101480 | Not Available | Enquire |
| 1-Benzyl-3-naphthalen-1-yl-urea-d7 | Stable Isotopes | CS-T-100787 | Not Available | Enquire |
| 1-Nitroso-1-(2-Hydroxyethyl)-3-(2-chloroethyl)urea-d4 | Stable Isotopes | CS-T-99938 | Not Available | Enquire |
| 4-[2-(5-Chloro-2-methoxybenzamido)ethyl]benzene Sulfonyl 1-B... | Stable Isotopes | CS-T-99328 | Not Available | Enquire |
| Acetylurea-13C2 | Stable Isotopes | CS-T-100933 | Not Available | Enquire |
| Cyanoacetylurea-13C,15N2 | Stable Isotopes | CS-T-101637 | Not Available | Enquire |
| Ensifentrine Des-Ethyl Urea-d6 | Stable Isotopes | CS-O-60228 | 76536-66-8(Unlabelled) | Enquire |
| Imidacloprid-urea-D4 | Stable Isotopes | CS-T-103989 | 120868-66-8(unlabelled) | Enquire |
| N-(Methyl-d3)-N-nitrosourea-13C | Stable Isotopes | CS-O-52485 | 2483824-34-4 | Enquire |
| N,N'-(1,2-Propylene)thiourea-d6 | Stable Isotopes | CS-T-94034 | 2122-19-2 (Unlabelled) | Enquire |
| N,N’-Dipropylurea-15N2,13C | Stable Isotopes | CS-T-100378 | 1329614-07-4 | Enquire |
| N-[6-(Trifluoromethoxy)-2-benzothiazolyl]urea-13C,15N2 | Stable Isotopes | CS-T-99057 | Not Available | Enquire |
| N-4-Hydroxyphenyl-N'-1,2,3-thiadiazol-5-ylurea-d4 | Stable Isotopes | CS-T-99210 | Not Available | Enquire |
| N-Methyl-N-nitroso Urea-d5 | Stable Isotopes | CS-T-96037 | 2733722-92-2 | Enquire |
| N-Methyl-N-nitroso Urea-d6 | Stable Isotopes | CS-T-100004 | Not Available | Enquire |
| N-Methylurea-d6 | Stable Isotopes | CS-T-99974 | 56683-43-3 | Enquire |
| N-Nitro-S-methylisothiourea-13C | Stable Isotopes | CS-T-102574 | 2986-25-6(Unlabelled) | Enquire |
| Propylene thiourea D3 | Stable Isotopes | CS-O-39849 | 2140327-66-6 | Enquire |
| Propylene thiourea D6 | Stable Isotopes | CS-O-39850 | 2512193-20-1 | Enquire |
| Tetraethylthiourea-d10 | Stable Isotopes | CS-T-104070 | 4274-15-1(unlablled) | Enquire |
API
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| Agomelatine Urea | API | CS-EO-03293 | 1366181-82-9 | Enquire |
| Carbamoyloxyurea | API | CS-ED-01295 | 4543-62-8 | Enquire |
| Dibaclofen Urea | API | CS-P-00664 | 2726264-10-2 | Enquire |
| Isohydroxyurea | API | CS-ED-01293 | 683-62-5 | Enquire |
| N-Ethylurea | API | CS-T-22130 | 625-52-5 | Enquire |
Metabolite
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| N-(Dicyclopropylmethyl)-N’-(2-chloroethyl)urea | Metabolite | CS-T-91827 | 54187-03-0 | Enquire |
Impurity
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 1-(2-Bromo-6-Fluorophenyl)-3-(2-Methoxy-5-(Trifluoromethyl)P... | Impurity | CS-O-48633 | 917389-23-2 | In Stock |
| 1-(3-(1H-imidazol-1-yl)propyl)-3-(1-ethyl-1H-indol-6-yl)urea | Impurity | CS-P-07137 | Not Available | Enquire |
| 1-(3-(4,5-dihydro-1H-imidazol-2-yl)phenyl)-3-(3-(2-hydroxyim... | Impurity | CS-O-53537 | ---- | Enquire |
| 1-(3,4-dichloro-1-methylpyrazole-5-sulfonyl)-3-(4,6-dimethyl... | Impurity | CS-O-60817 | ---- | Enquire |
| 1-(6-Cyano-5-(trifluoromethyl)pyridin-3-yl)thiourea | Impurity | CS-O-36234 | 2422147-84-8 | Enquire |
| 1-(6-Cyano-5-(trifluoromethyl)pyridin-3-yl)urea | Impurity | CS-O-36233 | Not Available | Enquire |
| 1,3-bis(2,4-difluorobenzyl)urea | Impurity | CS-O-51492 | Not Available | Enquire |
| 1,3-Bis(4-Chloro-3-(Trifluoromethyl)Phenyl)Urea | Impurity | CS-EO-00218 | 370-50-3 | In Stock |
| 1,3-bis(4-cyano-3-(trifluoromethyl)phenyl)urea | Impurity | CS-EO-01462 | 1895865-11-8 | In Stock |
| 1,3-Bis(4-Fluorobenzyl)-1-(1-Methylpiperidin-4-yl)Urea | Impurity | CS-O-42045 | ---- | In Stock |
| 1,3-Bis(4-Isobutoxybenzyl)Urea | Impurity | CS-EO-00104 | 955997-87-2 | In Stock |
| 1-[4-Chloro-2-(1'-hydroxy-1'-methylbenzyl)phenyl]-3-ethyl-2-... | Impurity | CS-T-11680 | 21740-97-6 | Enquire |
| 1-[4-Cyano-3-(trifluoromethyl)phenyl]thiourea | Impurity | CS-O-57405 | 1415552-04-3 | Enquire |
| 1-Butyl-3-[[4-[2-[(5-chloro-2-methoxybenzoyl)amino]ethyl]phe... | Impurity | CS-T-50175 | 38160-73-5 | In Stock |
| 1-ethyl-3-(3-(methylamino)propyl)urea | Impurity | CS-O-45135 | 1154561-28-0 | Enquire |
| 1-Hydroxy-3-phenylurea | Impurity | CS-O-54393 | 7335-35-5 | Enquire |
| 2-(2-Sulfoethyl)pseudourea | Impurity | CS-T-42801 | 25985-57-3 | In Stock |
| 2,5-Dithiobiurea | Impurity | CS-CG-00139 | 142-46-1 | Enquire |
| 3-((1r,4r)-4-(2-hydroxyethyl)cyclohexyl)-1,1-dimethylurea | Impurity | CS-O-40029 | 1698050-40-6 | Enquire |
| 3-(3-Oxocyclohex-1-en-1-yl)-1-Phenylurea | Impurity | CS-ZB-27495 | 300680-10-8 | Enquire |
| 3-Methyl-1-[[(methylcarbamoyl)amino]methylidene]urea | Impurity | CS-O-39751 | 65906-68-5 | Enquire |
| Amoxapine Chlorophenoxyaniline urea analog | Impurity | CS-O-47191 | 2514697-21-1 | Enquire |
| Cabozantinib urea dimer | Impurity | CS-O-44677 | 2840522-81-6 | Enquire |
| Cariprazine piperazine N-Oxide Urea impurity | Impurity | CS-O-57572 | ---- | Enquire |
| Cariprazine Urea N-Oxide impurity | Impurity | CS-O-57225 | ---- | Enquire |
| Darunavir N-methyl urea impurity | Impurity | CS-O-34249 | 1451010-37-9 | In Stock |
| Darunavir Urea impurity | Impurity | CS-O-12037 | Not Available | In Stock |
| Dibaclofen Urea mono lactum | Impurity | CS-EO-01006 | Not Available | Enquire |
| Ensifentrine des-ethyl urea impurity | Impurity | CS-O-57049 | 76536-66-8 | In Stock |
| Ensifentrine Urea impurity | Impurity | CS-O-57044 | 25017-47-4 | In Stock |
| Lenvatinib dimer Urea | Impurity | CS-O-44279 | 2143930-75-8 | Enquire |
| Lisdexamfetamine Urea Impurity | Impurity | CS-O-40265 | 4106-13-2 | In Stock |
| N,N'-Bis[3-(trifluoromethyl-4-cyanophenyl)thiourea | Impurity | CS-T-93479 | 1839619-50-9 | In Stock |
| N-[4-Chloro-2-(1-phenylethenyl)phenyl]-N'-ethylurea | Impurity | CS-O-36732 | 1622406-34-1 | Enquire |
| N′-(2-Chloroethyl)-N,N-dicyclohexylurea | Impurity | CS-O-47051 | 1222864-16-5 | Enquire |
| N-Ethyl Urea Relugolix | Impurity | CS-O-53673 | 2924011-35-6 | Enquire |
| Posaconazole destriazolone dimethylurea | Impurity | CS-O-47840 | Not Available | Enquire |
| Regorafenib Urea Impurity | Impurity | CS-O-14434 | 1333390-56-9 | In Stock |
| Urea impurity of pregabalin | Impurity | CS-O-42710 | Not Available | Enquire |
| Venetoclax Acyl urea impurity 2 | Impurity | CS-O-36766 | Not Available | Enquire |
| Venetoclax Acyl urea impurity 1 | Impurity | CS-O-36765 | Not Available | Enquire |
Intermediate
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 1-(2,4-Dichlorophenyl)urea | Intermediate | CS-BX-01306 | 5428-50-2 | In Stock |
| 1,3-Bis[3,5-bis(trifluoromethyl)phenyl]thiourea | Intermediate | CS-ED-21014 | 1060-92-0 | In Stock |
| 1-[3-(Dimethylamino)propyl]-3-ethylurea | Intermediate | CS-DV-00904 | 32897-26-0 | In Stock |
| 1-[4-(Trifluoromethyl)phenyl]-2-thiourea | Intermediate | CS-M-41758 | 1736-72-7 | In Stock |
| 5-Bromoquinazolin-6-ylthiourea | Intermediate | CS-T-08882 | 842138-74-3 | In Stock |
| Diazolidinyl Urea | Intermediate | CS-T-88756 | 78491-02-8 | In Stock |
| Tetramethylurea | Intermediate | CS-T-86355 | 632-22-4 | In Stock |
Fine Chemicals
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 1-(N-cyanocarbamimidoyl)-3-[4-(morpholin-4-yl)phenyl]urea | Fine Chemicals | CS-O-54944 | ---- | Enquire |
| 1,3-Dibenzylurea | Fine Chemicals | CS-T-88572 | 1466-67-7 | In Stock |
| 1,3-diethyl-1,3-dimethylurea | Fine Chemicals | CS-ZB-11143 | 31468-19-6 | Enquire |
| 1,3-Dimethylurea | Fine Chemicals | CS-DA-00433 | 96-31-1 | Enquire |
| 1-[2-(Dimethylamino)ethyl]-3-ethylurea | Fine Chemicals | CS-O-54270 | 62594-29-0 | Enquire |
| 1-[4-(morpholin-4-yl)phenyl]urea | Fine Chemicals | CS-O-54941 | 1341552-19-9 | Enquire |
| 1-Cyclohexyl-2-thiourea | Fine Chemicals | CS-MM-40015 | 5055-72-1 | Enquire |
| 3-(2-Cyanoacetyl)-1-methylurea | Fine Chemicals | CS-N-05166 | 6972-77-6 | In Stock |
| 4-Chlorophenylurea | Fine Chemicals | CS-M-42111 | 140-38-5 | In Stock |
| Acetylurea | Fine Chemicals | CS-ZH-04085 | 591-07-1 | Enquire |
| Cyanourea sodium salt | Fine Chemicals | CS-ZG-50187 | 76989-89-4 | Enquire |
| Decitabine Guanyl Urea Derivative | Fine Chemicals | CS-O-38760 | Not Available | Enquire |
| Guanylthiourea | Fine Chemicals | CS-ED-01890 | 2114-02-5 | In Stock |
| Methylenediurea | Fine Chemicals | CS-ED-01913 | 13547-17-6 | Enquire |
| N-(aminomethyl)-N,N'-dimethylurea | Fine Chemicals | CS-O-37908 | Not Available | Enquire |
| N,N-Bis-(Trimethylsilyl)-urea | Fine Chemicals | CS-O-03551 | 18297-63-7 | In Stock |
| N,N'-bis[4-(3- oxo-4- morpholinyl)phenyl]Urea | Fine Chemicals | CS-ED-01217 | 1855920-51-2 | Enquire |
| N,N-Diethylthiourea | Fine Chemicals | CS-DA-00437 | 105-55-5 | In Stock |
| N-Cyano-N′-methyl-S-methylisothiourea | Fine Chemicals | CS-O-56881 | 5848-24-8 | Enquire |
| N-Methylurea | Fine Chemicals | CS-DA-00440 | 598-50-5 | In Stock |
| N-Phenylthiourea | Fine Chemicals | CS-EP-00380 | 103-85-5 | Enquire |
| o-Methylisourea sulfate | Fine Chemicals | CS-DA-00442 | 29427-58-5 | Enquire |
| Tetraethylthiourea | Fine Chemicals | CS-ED-01478 | 4274-15-1 | Enquire |
| Thiourea | Fine Chemicals | CS-T-44270 | 62-56-6 | In Stock |
| Tris-(2-chloroethyl)urea | Fine Chemicals | CS-T-62570 | 71162-64-6 | Enquire |
Nitrosamine
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 1-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl)-3... | Nitrosamine | CS-O-44380 | 89854-43-3 | Enquire |
| 1-(2-chloroethyl)-3,3-dicyclohexyl-1-nitrosourea | Nitrosamine | CS-O-47052 | 500545-48-2 | Enquire |
| 1-ethyl-3-(3-(methyl(nitroso)amino)propyl)urea | Nitrosamine | CS-O-45136 | Not Available | Enquire |
| Nitrosomethyl Urea | Nitrosamine | CS-O-49714 | 36851-80-6 | Enquire |
Stable Isotope Reagent
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 1-(3-(bis(methyl-d3)amino)propyl)-3-ethylurea | Stable Isotope Reagent | CS-O-49857 | 32897-26-0(Unlabelled) | Enquire |
| 1-(3-(dimethylamino)propyl-1,1,2,2,3,3-d6)-3-ethylurea | Stable Isotope Reagent | CS-O-50606 | 32897-26-0 (Unlabelled) | Enquire |
| 1,3-Bis(2-chloroethyl-d4)-1-nitrosourea | Stable Isotope Reagent | CS-C-00471 | 154-93-8 (unlabelled) | Enquire |
| 1,3-Bis(4-nitrophenyl-13C6)-urea | Stable Isotope Reagent | CS-W-00490 | Not Available | Enquire |
| 1,3-Propylene-d6 Thiourea | Stable Isotope Reagent | CS-C-02068 | 1219802-05-7 | Enquire |
| Hydroxy-Urea-d3 | Stable Isotope Reagent | CS-O-55661 | 77923-90-1 | Enquire |
| Thio Urea 13C,15N2 | Stable Isotope Reagent | CS-O-10864 | 285977-83-5 | Enquire |
| Thiourea-13C | Stable Isotope Reagent | CS-EC-00099 | 113899-66-4 | Enquire |
Therapeutic
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| 1,3-Bis(2-chloroethyl)urea | Therapeutic | CS-T-06836 | 2214-72-4 | In Stock |
| Darunavir CBZ Urea Impurity | Therapeutic | CS-O-12075 | ---- | In Stock |
Building Blocks
| COMPOUND | CATEGORY | CAT. No. | CAS. No. | STOCK STATUS |
|---|---|---|---|---|
| (1,3-thiazol-2-ylmethyl)urea | Building Blocks | CS-TA-74231 | 1251308-97-0 | Enquire |
| 1-tert-Butyl-3-ethylthiourea | Building Blocks | CS-O-54010 | 14326-97-7 | Enquire |
| Urea Nitrate | Building Blocks | CS-O-54763 | 124-47-0 | Enquire |