CAS REGISTRY® CAS REGISTRY®, the CAS substance collection, is the premier source relied upon by scientists and regulators worldwide for accurate information on chemical substances
PubChem PubChem is the world's largest collection of freely accessible chemical information Search chemicals by name, molecular formula, structure, and other identifiers Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more
CAS Number Search - NIST Chemistry WebBook CAS registry numbers are copyrighted by the American Chemical Society Redistribution rights for CAS registry numbers are reserved by the American Chemical Society
CAS Data CAS REGISTRY®, the CAS substance collection, is the premier source relied upon by scientists and regulators worldwide for accurate information on chemical substances
助力创新与科学发现 | CAS Accelerating scientific breakthroughs for over 115 years Trusted by 96% of Fortune 500 pharmaceutical companies, CAS empowers researchers with the world's most comprehensive scientific data