S 1356 (OTTO) Semicarbazide hydrochloride, 98% Cas 563-41-7 - used to synthesize semicarbazones from aldehydes and ketones. S 1356 (OTTO) Semicarbazide hydrochloride, 98% Cas 563-41-7 - used to build a variety of heterocyclic compounds, some of which are potent antimicrobial and antiviral agents.