(-)-12-Fluorocalanolide B 183791-88-0 2H,6H,10H-Benzo[1,2-b:3,4-b':5,6-b'']tripyran-2-one, 12-fluoro-11,12-dihydro-6,6,10,11-tetramethyl-4-propyl-, [10S-(10.alpha.,11.beta.,12.beta.)]- AIDS-033399 AIDS033399 Calanolide B deriv.