“…The filtrate was dried and evaporated to leave 2.7 g of residue which was chromatographed on 60 g of silica gel with benzene, followed by benzene-ether (1:1, v/v). Evaporation of the fractions eluted with benzene and crystallization of the residue from methylene chloride-hexane yielded 1.33 g (49%) of product: mp 122-124°; nmr (CDCls) 2.78 (s,3,NCH3),4,C2 H, C3 H), 4.37 (s, 2, NCH2C«H6), 6.25-6.7 (m, 3, C6 H, C, H, C8 ), 7.21 (s, 5, C"H5).…”