2,3,5,6-Tetrahydro-N-(imino(2,3,5,6-tetrahydro-1H-imidazo(1,2-a)imidazol-1-yl)methyl)-1H-imidazo(1,2-a)imidazole-1-carboxamidine monohydrochloride 67939-48-4 EINECS 267-839-4