| http://www.w3.org/ns/prov#value | - For instance, according to the description, 4-hydroxylmandelic acid of the formula wherein W is a hydrogen atom or a C 1-C4 alkyl group, and an alkylating agent of the formula wherein T is a group capable of being split such as a halogen atom or arylsulfonyl group, can be allowed to react with each other in the presence of an acid binding agent, if necessary, followed by hydrolysis of the ester bo
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