(+)-Calanolide B 142632-33-5 2H,6H,10H-Benzo[1,2-b:3,4-b':5,6-b'']tripyran-2-one,11,12-dihydro-12-hydroxy-6,6,10,11-tetramethyl-4-propyl-,(10R,11S,12R)- AIDS-004465 AIDS004465 NSC675450