Synonyms: CIS-1,5-DIMETHYLBICYCLO[3.3.0]OCTANE-3,7-DIONE;3A,6A-DIMETHYLPERHYDROPENTALENE-2,5-DIONE;cis-tetrahydro-3a,6a-dimethylpentalene-2,5(1H,3H)-dione;CIS-1,5-DIMETHYLBICYCLO(3.3.0)OCTANE-3,7 -DIONE, 98+%;(3aβ,6aβ)-3a,6a-Dimethyloctahydropentalene-2,5-dione;1β,5β-Dimethylbicyclo[3.3.0]octane-3,7-dione;3a,4,6,6a-Tetrahydro-3aα,6aα-dimethyl-2,5(1H,3H)-pentalenedione;3aβ,6aβ-Dimethyltetrahydropentalene-2,5(1H,4H)-dione