(+/-)-(10,11-cis,11,12-cis)-10,11-Dihydro-12-hydroxy-6,6,10,11-tetramethyl-4-propyl-2H,6H,12H-benzo[1,2-b:3,4-b':5,6-b'']tripyran-2-one (+/-)-Calanolide C AIDS-071808 AIDS071808