5287-99-0 NSC57141 Urea, 1,1'-p-phenylenebis-[3-(p-2-imidazolin-2-ylphenyl)-, dihydrochloride Urea, N,N''-1,4-phenylenebis-[N'-[4-(4,5-dihydro-1H-imidazol-2-yl)phenyl]-, dihydrochloride