(+)-Calanolide A 142632-32-4 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,12S)- AIDS-004462 AIDS004462 Calanolide A NSC650886 NSC675451