2H-3,11a-Methanonaphth(2,3-b)oxepin-2,5(11H)-dione, 3,4-dihydro-3,10,11,12-tetrahydroxy-4-methyl-12-(3-methylbutyl)-, (3alpha,4alpha,10beta,11abeta,12S*)-(-)- 93361-65-0 Rishirilide A