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The vial was sealed and heated in the microwave to 200 °C for 2 hours. The solvent was then evaporated and the product purified by silica gel chromatography using petroleum ether : ethyl acetate as the eluent, p.10 ,
400 MHz, d 6 -DMSO): ? (ppm) 11.45-11, 1H), 8.05 (d, J = 8.1 Hz, 1H), p.56 ,