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Compound 120 (200 mg, 0.26 mmol) was dissolved in degassed dichloromethane (30 ml). Hoveyda-Grubbs catalyst 11 generation (16 mg, 0.026 mmol) was then added and the mixture was refluxed under argon atmosphere overnight. The solvent was then evaporated and the crude product was purified by silica chromatography (1% methanol in ether) which gave 39 mg (20%) of the title product. MS (M+H+) 728.2

1. temperaturethe mixture was refluxed under argon atmosphere overnight
2. customThe solvent was then evaporated
3. customthe crude product was purified by silica chromatography (1% methanol in ether) which