Search chemicals by identifier, name or value prefix

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GET

/chemical/search/start-with/{word}

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Path

Query

Multi-step chemical search.

1. Pre-processing: trim + uppercase; EC numbers (NNN-NNN-N), CASRN (leading zeros stripped), InChIKeys and numeric values (e.g. partial CASRN 1912-24) keep their dashes; unicode dashes are normalized; otherwise - is replaced by a space.
2. Exact step: rows whose modified value equals the word (or the word without spaces) for the configured identifier/name types.
3. Prefix step (skipped for CASRN, CI chemical/compound ids, DTXSID/DTXCID, or when the first exact hit is a CASRN): rows whose modified value starts with the word, limited to top. InChIKey values are included only when the word is at least 14 characters long.
4. Post-processing: exact rows first, de-duplicated by chemical (first row wins), limited to top.

No match returns 200 with empty data, explanatory messages and optional suggestions (e.g. a formatted CASRN for digits-only input, or related InChIKeys).

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curl -X GET "https://example.com/chemical/search/start-with/water?projection=standard&top=100"

{  "data": [    {      "id": 1,      "cichemId": "CICHEM000200014",      "casrn": "50-00-0",      "preferredName": "Formaldehyde",      "searchName": "cas_rn",      "searchValue": "50-00-0",      "rank": 5,      "hasStructureImage": true    }  ],  "total": 1,  "suggestions": [],  "messages": []}