oral contraceptives drospirenone
(6R,7R,8R,9S,10R,13S,14S,15S,16S,17S)-1,3',4',6,6a,7,8,9,10,11,12,13,14,15,15a,16-Hexadecahydro-10,13-dimethylspiro-(17H-dicyclopropa(6,7:15,16)cyclopenta(a)phenanthrene-17,2'(5'H)-furan)-3,5'(2H)-dione