12-Thiocalanolide B 183791-90-4 2H,6H,10H-Benzo[1,2-b:3,4-b':5,6-b'']tripyran-2-one, 11,12-dihydro-12-mercapto-6,6,10,11-tetramethyl-4-propyl-, [10S-(10.alpha.,11.beta.,12.beta.)]- AIDS-033400 AIDS033400 Calanolide B deriv.