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SynThink is a trusted producer and supplier of Pharmaceutical Reference Standards, including Impurity Standards. These materials are essential for pharmaceutical companies conducting research into the quality, stability, and biological safety of drug products. We maintain a robust inventory of API impurities, ready to support your development and regulatory needs.
![Methyl ((S)-4-Methyl-2-[2-oxo-2-[[(S)-1-phenylethyl]amino]ethyl]pentyl]carbamate | 930280-44-7 | Pregabalin](https://synthinkchemicals.com/wp-content/uploads/2025/04/SA24839.png)
![Methyl (4-amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-6-((methoxycarbonyl)amino)pyrimidin-5-yl)(methyl)carbamate | 2518331-19-4 | Riociguat](https://synthinkchemicals.com/wp-content/uploads/2025/04/SA50817.png)
![Methyl (4-amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-6-(methylamino)pyrimidin-5-yl)carbamate | 2514697-53-9 | Riociguat](https://synthinkchemicals.com/wp-content/uploads/2025/04/SA50815.png)
![Methyl (4,6-diamino-2-(1-(3-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)pyrimidin-5-yl)(methyl)carbamate | Riociguat](https://synthinkchemicals.com/wp-content/uploads/2025/04/SA50818.png)
![Methyl 1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carbimidate | 304874-06-4 | Riociguat](https://synthinkchemicals.com/wp-content/uploads/2025/04/SA50812.png)
![Methyl 7-cyclopentyl-2-((5-(piperazin-1-yl)pyridin-2-yl)amino)-7H-pyrrolo[2,3-d]pyrimidine-6-carboxylate | 3027550-97-3 | Ribociclib](https://synthinkchemicals.com/wp-content/uploads/2025/04/SA47107.png)
![Methyl-Dihydropurinone {6-amino-2-[1-(2-fluorobenzyl)-1H-pyrazolo [3, 4-b] pyridin-3-yl]-7-methyl-7, 9-dihydro-8H-purin-8-one} | 1361569-18-7 | Riociguat](https://synthinkchemicals.com/wp-content/uploads/2025/04/SA50821.png)
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