25787-14-8 NSC73854 Urea, 1,1'-(2-chloro-1,4-phenylene)bis[3-[m-(1,4,5,6-tetrahydro-2-pyrimidinyl)phenyl]-, dihydrochloride Urea, N,N''-(2-chloro-1,4-phenylene)bis[N'-[3-(1,4,5,6-tetrahydro-2-pyrimidinyl)phenyl]-, dihydrochloride