CAS Registry Number

CAS 103-72-0 — Phenyl isothiocyanate

Phenyl isothiocyanate is a reactive organic compound widely used as a derivatizing agent in amino acid analysis, peptide sequencing, and pharmaceutical synthesis. It forms stable thiourea derivatives with amines, aiding in structural identification. This clear to pale yellow liquid has a CAS number of 103-72-0, molecular formula C6H5NCS, and a molecular weight of 135.19 g/mol. Store at ambient conditions, but handle with caution—it carries a **Danger** signal word due to its irritant and sensitizing properties. Molekula supplies Phenyl isothiocyanate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.