| http://www.w3.org/ns/prov#value | - treating with an acid such as for example trifluoroacetic acid or hydrogen chloride in the presence of a solvent such as for example methylene chloride, ethyl acetate or dioxane at temperatures between 0??? C. and the boiling temperature of the solvent used, [0294] the 2,2,2-trichloroethoxycarbonyl group which can be cleaved by treating with metals such as for example zinc or cadmium in a solvent
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