Spironolactone Gammalactone Impurity

Chemical Name: (8R,9S,10R,13S,14S,17R)-3-methoxy-10,13-dimethyl-1,2,3',4',7,8,9,10,11,12,13,14,15,16-tetradecahydro-5'H-spiro[cyclopenta[a]phenanthrene-17,2'-furan]-5'-one

Smile: C[C@@]12[C@@](CCC3=O)(O3)CC[C@@]1([H])[C@@](CC=C4[C@@]5(CCC(OC)=C4)C)([H])[C@]5([H])CC2