1,2,15,16-Tetrahydrotanshiquinone 1,2,8,9-Tetrahydro-1,6-dimethylphenantrho(1,2-b)furan-10,11-dione 126979-84-8 Phenantrho(1,2-b)furan-10,11-dione, 1,2,8,9-tetrahydro-1,6-dimethyl-