| http://www.w3.org/ns/prov#value | - Unsubstituted or substituted diphenylmethoxycarbonylamino, ten-lower alkoxycarbonylamino or 2-trisubstituted silylethoxycarbonylamino can be cleaved by treatment with a suitable acid, for example formic or trifluoroacetic acid; unsubstituted or substituted benzyloxycarbonylamino can be cleaved, for example, by means of hydrogenolysis, that is to say by treatment with hydrogen in the presence of a
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