from fungus Cryptoporus volvatus; inhibitor of superoxide anion radical release; slightly enhances tumor promotion of okadaic acid & activates protein kinases; RN from Chem Abstract Index Guide 1991; RN given refers to ((1R-(1R*,5S*,8R*,9S*,13R*,17S*,18R*,22S*,25R*,26S*,30R*,34S*)-isomer); RN for cpd without isomeric designation not avail 7/91