2H,6H,10H-Benzo(1,2-b:3,4-b':5,6-b'')tripyran-2-one, 7,8,11,12-tetrahydro-12-hydroxy-6,6,10,11-tetramethyl-4-propyl-, (10S-(10alpha,11beta,12beta))- 909-13-7 Dihydrocostatolide NSC 661123