# PubChem Compound Synonyms Lookup

> PubChem Compound Synonyms Lookup is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-16).

Returns all names, synonyms, brand names, CAS numbers, and PubChem CID for a pharmaceutical or chemical compound by name query.

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/compound-synonyms
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pubchem-compound-synonyms-lookup-3f2bee81
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SeFaCqE1M0MbPcFrnymNV

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability pubchem-compound-synonyms-lookup-3f2bee81 -d '<json body>'
```

Example prompt: Can you look up all the synonyms, brand names, and CAS number for ibuprofen from PubChem — I need the CID and every trade name associated with it.

## When to prefer this

Use this endpoint when you need to resolve a pharmaceutical or chemical compound name to its canonical identifiers (CID, CAS) or discover all its known synonyms and brand names. Ideal for drug name disambiguation, pharmaceutical research, and chemical informatics workflows. Prefer this over manual PubChem API calls when you need a pay-per-use, low-friction lookup without managing API keys.

## Known failure modes

- Compound not found in PubChem — returns empty or error response
- Ambiguous name matching multiple compounds — may return results for the most common match
- Misspelled compound name — no results returned
- Very novel or proprietary compounds not yet in PubChem — no data available

## How this service works

PHARMA: names/synonyms and CID for a compound (PubChem) — brand names, CAS, trade names. ?q=name. Returns JSON.

## Output

A JSON object containing the PubChem CID for the queried compound along with a comprehensive list of synonyms including generic names, brand/trade names, CAS registry numbers, IUPAC names, and other chemical identifiers sourced from PubChem.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pubchem-compound-synonyms-lookup-3f2bee81/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)