The organic layer was evaporated under vacuum. After dilution with 20 ml n-BuOH, the organic layer was washed with 5% citric acid (2 5 ml) and water (2 5 ml), dried over anhydrous Na2SO4 and filtered. The solvent was removed using a rotary evaporator and the residue was recrystallised from methanol/ether to give the product in yield (3) (0.26 g) 71.4%, mp 190–191 C (dec). Com- pound 3 had the following characteristics;