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Compound 424 (100 mg, 0.25 mmol) and O-benzyl-hydroxylamine (80 mg, 0.50 mmol) were treated as described for compound 337. Flash chromatography (ethyl acetate/petroleum ether: graduated from 80/20 to 60/40) provided the title compound. 13C NMR (CDCl3) δ 195.3, 165.8, 159.3 (dd), 155.7 (dd), 148.2, 142.2, 139.8, 135.4, 135.1, 133.8, 131.7, 129.4, 129.1, 128.9, 128.7, 127.8, 124.6 (dd), 124.1 (dd), 116.2, 112.8, 111.7 (dd), 105.0 (dd), 78.5, 20.4