2,4-Dimethyl-4,4a,5,9b-tetrahydroindeno(1,2-d)-1,3-dioxin 2,4-Dimethyl-5,6-indeno-1,3-dioxan 27606-09-3 EINECS 248-561-2 Indeno(1,2-d)-1,3-dioxin, 4,4a,5,9b-tetrahydro-2,4-dimethyl-