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Compound 424 (50 mg, 0.12 mmol) and N,N-dimethyl-hydrazine (19 μL, 0.25 mmol) were treated as described for compound 337. Flash chromatography (ethyl acetate/petroleum ether: graduated from 67/33 to 80/20) provided the title compound. 13C NMR (DMSO-d6) δ 194.7, 163.2, 158.9 (dd), 155.9 (dd), 149.6, 139.6, 139.5, 133.9, 133.8, 131.3, 131.0, 129.1, 127.2, 126.7 (dd), 126.3, 124.2 (dd), 114.9, 112.0 (dd), 111.9, 105.1 (dd), 46.1, 19.6