5300-47-0 NSC57144 Urea, 1,1'-m-phenylenebis-[3-(m-2-imidazolin-2-ylphenyl)-, dihydrochloride Urea, N,N''-1,3-phenylenebis-[N'-[3-(4,5-dihydro-1H-imidazol-2-yl)phenyl]-, dihydrochloride