12-Deoxy-11,12-dihydrocalanolide A 183791-89-1 2H,6H,10H-Benzo[1,2-b:3,4-b':5,6-b'']tripyran-2-one, 7,8-dihydro-6,6,10,11-tetramethyl-4-propyl-, (R)- AIDS-033398 AIDS033398 Calanolide A deriv.