1,4-Dioxan-2-one, 3,5,5,6-tetrafluoro-3,6-bis(trifluoromethyl)- 3,5,5,6-Tetrafluoro-3,6-bis(trifluoromethyl)-1,4-dioxan-2-one 7309-84-4 EINECS 230-766-3