25979-49-1 NSC72589 Urea, 1,1'-p-phenylenebis[3-[m-(4-methyl-2-imidazolin-2-yl)phenyl]-, dihydrochloride Urea, N,N''-1,4-phenylenebis[N'-(3-(4,5-dihydro-4-methyl-1H-imidazol-2-yl)phenyl]-, dihydrochloride