2-Amino-3-chlorobenzenethiol (CAS 40925-72-2) has a molecular formula of C?H?ClNS and a molecular weight of 159.64 g/mol, with an amino group (-NH?), a chloro group (-Cl), and a thiol group (-SH) attached to the benzene ring at the 2-, 3-, and 1-positions, respectively. As an aromatic compound with multiple functional groups, it is a key intermediate in synthesizing heterocyclic compounds (e.g., benzothiazoles) and pharmaceuticals. It requires sealed, cool, dry storage to prevent thiol oxidation or moisture-induced reactions, ensuring reactivity for synthetic applications.