2-(2,6-Dichlorobenzylidenehydrazino)-1,4,5,6-tetrahydropyrimidine hcl 55083-70-0 Benzaldehyde, 2,6-dichloro-, (1,4,5,6-tetrahydro-2-pyrimidinyl)hydrazone, monohydrochloride OT 24 OT-24