drospirenone [ 1,2-dihydro-spirorenone,ZK 30595,dihydrospirorenone,1,2-dihydrospirorenone,6beta,7beta,15beta,16beta-dimethylen-3-oxo-17alpha-pregn-4-en-21,17-carbolacton,ZK30595 ] a progestational compound with antimineralocorticoid and antiandrogenic activity; structure given in first source