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(4aS,4bR,5S,6aS,6bS,9aR,10aS,10bS,12S)-4b,12-difluoro-6b-(2-fluoro-ace tyl) -5-hydroxy-4a,6a-dimethyl-2-oxo-2,4b,5,6,6a,6b,7,9,9a,10,10a,10b, 11,12- tetradecahydro-4aH-8-aza-pentaleno[2,1-a]phenanthrene-8-carboxylic acid vinyl ester