prov:value
| - # in which R.sub.2 means a hydrogen atom or a cyano group, R.sub.3 and R'.sub.3 may be the sameor different and individually denote a phenyl group or an aralkyl group, and B is an oxygen atom, sulfur atom, carbonyl group, hydroxymethylene group, sulfinyl group, sulfonyl group, or a cyclic or acyclic acetal group, and n stands for 0 or 1, whichcomprises:causing a hydroxylamine, which is represented
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