3,6,9,12-Tetraazatetradecamethylenediamine 3,6,9,12-Tetraazatetradecane-1,14-diamine 4-04-00-01245 (Beilstein Handbook Reference) 4067-16-7 778592-37-3 BRN 1768042 CCRIS 6264 EINECS 223-775-9 PEHA PENTAETHYLENEHEXAMINE