4,5-Dihydro-3,8-dimethyl-4,5-dioxo-phenanthro<4,3-b>furan
3,8-Dimethyl-phenanthro[4,3-b]furan-4,5-dione
11,16-oxy-18,20-dinor-1,3,5(10),6,8,11,15-abietaheptaene-13,14-dione
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