4,10-diacetyl-11,13-dihydroxy-2,12-dimethyl-8-oxatricyclo[7.4.0.0^{2,7}]trideca-1(9),6,10,12-tetraene-3,5-dione

4,10-diacetyl-11,13-dihydroxy-2,12-dimethyl-8-oxatricyclo[7.4.0.0^{2,7}]trideca-1(9),6,10,12-tetraene-3,5-dione