19-nortestosterone have led to the synthesis of over 60 androstane and estrane derivatives whose sensory evaluation has allowed molecular parameters to be established for release of a ‘steroid-type’ scent. Odorperception with O-containing compounds in both classes has been found to be regioselective1. Osmophoric groups at C(3) were found to be the most active and specific. Functionality at C(2) is accompanied