N,N-bis(p-nitrophenyliminomethyl)-p-nitroaniline
N1-(p-chlorobenzoyl)-N1,N2-di(p-nitrophenyl)formamidine
N1-(o-chlorobenzoyl)-N1,N2-di-(p-nitrophenyl)formamidine
N1,N2-di-(p-nitrophenyl)formamidine
N-(p-chlorobenzoyl)-2-(p-chlorophenyl)ethylamine