| http://www.w3.org/ns/prov#value | - X represents a halogen atom and then, halogen atom (X) of the ester is reacted with carboxylic acid group or its salt group of the methylated PG to obtain the product ofthe present invention.The binding agent can be a compound having the formula(n is 1 or 2; and X is a halogen atom) such as monochloroacetic acid, monobromoacetic acid, and monobromopropionic acid; a compound having the formulasuch
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