(S,S)-Tetrahydrochrysene ((S,S)-THC) is a steroid-like nonsteroidal estrogen and agonist of both the estrogen receptors, ERñ and ERò. It is an enantiomer of (R,R)-tetrahydrochrysene ((R,R)-THC), which, in contrast, is an ERò silent antagonist and ERñ agonist with 10-fold selectivity (i.e., affinity) for the ERò over the ERñ and with 20-fold greater affinity for the ERò relative to that of (S,S)-THC.