3-Lactone ester Eplerenone

Chemical Name: (2'R,5aS,5bR,6aR,7aS,11R)-methyl 5a,7a-dimethyl-3,5'-dioxo-4,4',5,5a,5',6a,7,7a,9,10,10a,10b,11,12-tetradecahydro-3H,3'H-spiro[cyclopenta[5,6]oxireno[2',3':8,8a]naphtho[2,1-c]oxepine-8,2'-furan]-11-carboxylate

Smile: O=C([C@@H](C1C2[C@]([C@](OC3=O)(CC3)CC2)(C)C[C@]4([H])[C@@]15O4)CC([C@]5(C)CC6)=COC6=O)OC