(-)-7,8-Dihydro-12-oxocalanolide B 2H,6H,10H-Benzo[1,2-b3,4-b'5,6-b]tripyran-8,10(7H)- dione deriv. 2H,6H,12H-Benzo[1,2-b:3,4-b':5,6-b'']tripyran-2,12-dione, 7,8,10,11-tetrahydro-6,6,10,11-tetramethyl-4-propyl-, (10S-trans)- 4867-21-4 AIDS-030395 AIDS030395 NSC665158