68656-54-2 N-((Ethylamino)iminomethyl)-N'-(2-methylphenyl)-urea hydrochloride Urea, 1-ethylamidino-3-(o-tolyl)-, hydrochloride Urea, N-((ethylamino)iminomethyl)-N'-(2-methylphenyl)-, monohydrochloride