You can try to dehydrate the 3β-methyl group to form an alkene. This can be achieved by using strong acids or other reagents that can eliminate water from the molecule. For example, you might use concentrated sulfuric acid to remove the hydroxyl group from the 3β-methyl position.
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benzyl (2S,3S,6R,7R)-3-chloroacetoxy-3-methyl-8-oxo-7-phenoxyacetamido-5-thia-1-azabicyclo<4.2.0>octane-2-carboxylate
(S)-2-(2-tert-Butoxycarbonylamino-acetylamino)-3-[(2R,3R,4R,5S,6R)-4,5-diacetoxy-6-acetoxymethyl-3-(2-tritylsulfanyl-acetylamino)-tetrahydro-pyran-2-yloxy]-propionic acid allyl ester
potassium p-methoxyphenylacetate
C28H22N8O6
