Eplerenone 1,4-dioxane solvate

Eplerenone is an aldosterone receptor antagonist. Single crystals of the title compound [systematic name: 9 alpha, 11-epoxy-7 alpha-( methoxycarbonyl)- 3-oxo-17 alpha-pregn-4-ene-21,17-carbolactone dioxane solvate], C24H30O6 center dot C4H8O2, were obtained from a dioxane solution. Within the eplerenone molecule, both five- membered rings display an envelope conformation. The three six- membered rings exhibit different conformations: chair, half- chair and envelope. In the crystal structure, adjacent eplerenone molecules are linked together via weak intermolecular C-H center dot center dot center dot O hydrogen bonding, forming a cavity of about 310 angstrom(3), and the dioxane solvent molecules occupy the cavity. The solvent molecule is disordered equally over two positions.