1,3-Diisopropyl-2-(p-nitrobenzyl)isourea 2978-11-2 4-Nitrobenzyl 8 CCRIS 7994 Carbamimidic acid, N,N'-bis(1-methylethyl)-, (4-nitrophenyl)methyl ester EINECS 221-027-6 O-p-Nitrobenzyl-N,N'-diisopropylisourea O-p-Nitrobenzyl-N,N'-diisopropylurea