PubChem

Where every molecule page here gets its identity: structures, formulas, synonyms and identifiers from the US National Library of Medicine. The Molecule section of each page is anchored on a PubChem record.

PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more.

— pubchem.ncbi.nlm.nih.gov, its own description of itself as published on 2026-08-25

The 2 screen grabs are ours, captured on 2026-08-25 as a signed-out visitor would see the page; the site may have changed since.

Kind: instrument. Link: https://pubchem.ncbi.nlm.nih.gov/