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tooluniverse-chemical-sourcing

Find commercial sources for chemical compounds — PubChem/ChEMBL identity resolution then vendor catalog search across ZINC, Enamine, eMolecules, Mcule. Compares pricing, availability, and identifies purchasable analogs when an exact compound is not in stock. Use for chemical procurement, virtual library curation, and 'where can I buy X' questions for synthesis planning.

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# Chemical Compound Sourcing & Procurement

Pipeline for identifying, sourcing, and purchasing chemical compounds from commercial vendors. Resolves compound identity through PubChem/ChEMBL, searches multiple vendor databases (ZINC, Enamine, eMolecules, Mcule), compares pricing and availability, and identifies purchasable analogs when exact compounds are unavailable.

**Guiding principles**:
1. **Identity first** -- confirm the compound's structure (SMILES, InChI) before searching vendors; names can be ambiguous
2. **Multi-vendor comparison** -- always check multiple sources; pricing and stock vary significantly
3. **Analog fallback** -- if the exact compound is unavailable, search for close analogs
4. **Purity and quantity awareness** -- note catalog purity grades and minimum order quantities
5. **Structure over name** -- vendor searches by SMILES/InChI are more reliable than name searches
6. **English-first queries** -- use English compound names in tool calls

## LOOK UP, DON'T GUESS
When uncertain about any scientific fact, SEARCH databases first rather than reasoning from memory. A database-verified answer is always more reliable than a guess.