Benzenecarboximidamide, 4,4'-[1,4-phenylenebis(iminocarbonylimino)]bis[N-[4-[imino(methylamino)methyl]phenyl]-, tetrahydrochloride NSC82513 Urea, 1,1'-p-phenylenebis[3-[p-[N'-[p-(N'-methylamidino)phenyl]amidino]phenyl]-, tetrahydrochloride