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Look up chemicals in CAS Common Chemistry (name, CAS RN, SMILES, InChI; ~500k compounds)

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# CAS Common Chemistry

Query [CAS Common Chemistry](https://commonchemistry.cas.org/) for compound names, CAS Registry Numbers®, molecular formula, mass, SMILES, InChI, and experimental properties. Covers nearly 500,000 compounds (CC BY-NC 4.0).

**API access:** Request a free API key at [https://www.cas.org/services/commonchemistry-api](https://www.cas.org/services/commonchemistry-api). The script works without a key for public endpoints; if CAS requires a key, set `CAS_API_KEY` or use `~/.scienceclaw/cas_config.json`.

## Overview

- Search by compound name (supports trailing wildcard, e.g. `aspirin*`), CAS RN, SMILES, or InChI/InChIKey
- Get detail: name, formula, mass, InChI, SMILES, experimental properties (e.g. melting point, density)
- Reference: `references/cas-common-chemistry-api.md`

## Usage