(5S,10S,14S,2R)-5-Ethyl-14-hydroxy-14-(hydroxymethyl)-2,6,10,12-tetramethyl-8-methylene-4-oxacyclotetradeca-6,11-diene-1,3-dione 100157-26-4 AIDS-107798 AIDS107798 Galbonolide B Neorustmicin A