Briefly,anhydrousNa2SO4 was added(1:5,w/w),andthehomogenatewas
placed intoanErlenmeyerflaskwithaglassstopperandextractedwith80mLhex-
ane:acetone mixture(3:1,v/v)for16husingamagneticstirrer.Afterdecantinginto
new flasksandconcentratingunderagentlenitrogenstreamtoa5-mLvolume,
the extractswerefractionatedbycolumnchromatography