The pooled butanolic layer was evaporated under reduce pressure to give a residue which was dissolved in 100 ml methanol and precipitated by adding a large amount of diethyl ether to obtain a solid crystalline dark brown compound
The pooled butanolic layer wasevaporated under reduce pressure to give a residue which was dissolvedin 100 ml methanol and precipitated by adding a large amount of diethylether to obtain a solid crystalline dark brown compound