Pharmaceutical & Chemical Intermediates,
indexed by CAS number
Search 713,000+ intermediates by CAS registry number or name. CoA, MSDS and custom synthesis support from a National High-Tech Enterprise working with the Chinese Academy of Sciences.
Browse by product family
Heterocycles, halogenated building blocks, boronic acids, chiral amines and photoelectric materials.
Featured intermediates
A selection from our current catalogue — search the full library by CAS number.
Why source intermediates from CATO
Full traceability, batch by batch
Every lot ships with a batch-specific CoA, chromatograms and a documented starting-material trail — the paperwork your QA team actually needs.
Custom synthesis in-house
Route scouting, impurity isolation and identification, and scale-up from gram to kilogram, run in our own Guangzhou laboratories.
Quality system built for standards
ISO 17034 reference-material producer and ISO 9001 quality management, audited annually. The same discipline applies to our intermediate line.
Direct technical contact
You speak to the chemist and the account manager who own your project — not a ticket queue. Quotes usually within 24 hours.
Frequently asked questions
What kinds of intermediates does CATO supply?
CATO supplies pharmaceutical intermediates, API building blocks, impurity standards and photoelectric materials — over 713,000 catalogued compounds with CAS registry numbers, spanning heterocycles, boronic acids, halogenated building blocks, chiral amines and more.
Can I search by CAS number?
Yes. Every product page is addressed by its CAS number. Enter a CAS registry number in the search box and you will be taken directly to the compound's specification page, or use the product search to browse by name.
Do you provide CoA and MSDS?
Every shipment is accompanied by a batch-specific Certificate of Analysis and MSDS. HPLC or GC chromatograms, residual solvent data and elemental analysis are available on request.
Do you offer custom synthesis?
Yes. Our Guangzhou laboratories carry out route scouting, impurity isolation and identification, and scale-up from gram to kilogram quantities. Send us a structure and target quantity for a feasibility assessment.
What is the typical lead time?
Stock items ship within 3–5 working days. Made-to-order compounds are typically quoted at 2–6 weeks depending on synthetic complexity. Lead time is confirmed in every quotation.
Looking for a compound that is not in the catalogue?
Send us the structure or CAS number. We will confirm availability or quote a custom synthesis.