3 6 dimethyl 4 5 6 7 tetrahydro 1 benzofuran July 8, 2019 16 32 64 128 4 5 6 7-tetrahydro-3 6-dimethylbenzofuran 2(4h)-benzofuranone 5 6 7 7a-tetrahydro-4 4 7a-trimethyl- (r)- 5 6 7 7a-tetrahydro-3 6-dimethylbenzofuran-2 (4h)-one
