CAS Registry Number

CAS 330645-87-9 — O-(1H-6-Chlorobenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HCTU)

HCTU is a highly efficient coupling reagent used in peptide synthesis to activate carboxylic acids, enabling amide bond formation with minimal racemization. It is particularly valued for its mild reaction conditions and compatibility with sensitive functional groups. This chemical has a CAS number of 330645-87-9, a molecular formula of C11H15ClN5O PF6, and a molecular weight of 413.69. It should be stored at ambient temperatures, and it carries a signal word of warning for safety. Molekula supplies HCTU from research to bulk quantities with full documentation and ISO 9001:2015 traceability.