1-Azacyclopentane 123-75-1 25150-61-2 5-20-01-00162 (Beilstein Handbook Reference) AI3-24117 Azacyclopentane Azolidine BRN 0102395 Butylenimine CCRIS 6688 EINECS 204-648-7 FEMA No. 3523 HSDB 120 NSC 62781 PYRROLIDINE Perhydropyrrole Prolamine Pyrrole, tetrahydro- Pyrrolidine [UN1922] [Flammable liquid] Pyrrolidine ring Tetrahydropyrrole Tetramethylenimine UN1922