29-Nordammara-1,17(20),24-trien-21-oic acid, 6,16-bis(acetyloxy)-3,7-dioxo-, (4.alpha.,6.beta.,8.alpha.,9.beta.,13.alpha.,14.beta.,16.beta.,17Z)- 29400-42-8 Fumigacin HELVOLIC ACID NSC319943