1,5-Bis(dibutylphosphonoformamido)naphthalene 1,5-Naphthylenedicarbamoylbis(dibutylphosphonate) 2231-13-2 BRN 2799023 NSC 203391 Phosphonic acid, (1,5-naphthylenebis(iminocarbonyl))di-, tetrabutyl ester (8CI) Phosphonic acid, 1,5-naphthylenedicarbamoyldi-, tetrabutyl ester