1-HEXENE 1-Hexene [UN2370] [Flammable liquid] 1-n-Hexene 153522-12-4 33004-04-5 592-41-6 AI3-28797 Butyl ethylene Butylethylene Dialene 6 EINECS 209-753-1 HSDB 1079 Hexene Hexene-1 Hexylene NSC 74121 UN2370