and the filtrate was evaporated to yield 2.74 g ofa viscous oil. The oil was chromatographed on an ods column with H,O-MeQH (9: 1) and flow rate 3 ml/min to yield 1, 2, and 3
and the filtratewas evaporated to yield 2.74 g ofa viscous oil. Theoil was chromatographed on an ods column withH,O-MeQH (9: 1) and flow rate 3 ml/min to yield1, 2, and 3