Cysteine
CAS 52-90-4 2 API suppliersSmall Molecule
Overview
Cysteine is a small molecule active pharmaceutical ingredient (ChEMBL CHEMBL863).
API suppliers (2)
Suppliers of Cysteine evidenced by a US FDA Type II Drug Master File or an EU Certificate of Suitability (CEP). Sources: FDA DMF list, EDQM certification database.
- NIPPON PROTEIN CO INC1 active DMF
- SIGMA F AND D DIV LTD
Patent & exclusivity (US)
Per the FDA Orange Book (1 approved US product), the latest listed US patent on Cysteine expires 15 Jan 2039. Generic API sourcing typically opens up once these lapse.
Chemical identity
- IUPAC name
- (2R)-2-amino-3-sulfanylpropanoic acid
- Canonical SMILES
- C([C@@H](C(=O)O)N)S
- InChIKey
- XUJNEKJLAYXESH-REOHCLBHSA-N
Verified Supplier Partner
Do you supply Cysteine? Get in front of buyers actively sourcing it.
We route real sourcing requests from pharma buyers to vetted, verified partners — qualified leads, not just a listing. Tell us what you make and we'll be in touch about becoming a Verified Supplier Partner.
Ready to Accelerate Your
Discovery Workflow?
Find, vet, and source drug-manufacturing partners faster — with FDA compliance screening built in. Start free for 7 days.