Chemical Compound Information Retrieval Retrieve comprehensive chemical compound data with proper disambiguation and cross-database validation. LOOK UP DON'T GUESS : Never assume a CID, ChEMBL ID, or molecular property value. Always retrieve from PubChem/ChEMBL. English-first : Always use English compound names in tool calls. Respond in user's language. Domain Reasoning: Disambiguation "Aspirin" = one compound. "Vitamin D" = multiple forms (D2/D3/active metabolite). For generic class names (steroids, vitamins, acids), present candidates and confirm before proceeding. --- Workflow Phase 1: Dis…