2 2 4 6 7 pentamethyldihydrobenzofuran 5 sulfonyl July 8, 2019 16 32 64 128 2 2 4 6 7 pentamethyldihydrobenzofuran 5 sulfonyl chloride 2 5-dimethylfuran-3 4(2h 5h)-dione 2(4h)-benzofuranone 5 6 7 7a-tetrahydro-4 4 7a-trimethyl- (r)- 2 5-dimethylfuran 2 4-dimethyl-4-phenyltetrahydrofuran 2 6-diformyl-4-methylphenol
