| http://www.w3.org/ns/prov#value | - t the protecting group is ???a methyl group substituted by 1 to 3 aryl groups??? or ???a methyl group substituted by 1 to 3 aryl groups wherein aryl ring is substituted by lower-alkyl, lower-alkoxy group, halogen atom or a cyano group???, deprotection is carried out by a reducing reagent in an inert solvent. [0228] Preferred solvents employed are alcohols such as methanol, ethanol and isopropanol;
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