prov:value
| - Further, preferred among the above alkyl groups which may be substituted, is an alkyl group which may be substituted by a substituent selected from the group consisting of a halogen atom, a carboxyl group and an aryl group, such as a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, a carboxymethyl group, a carboxyethyl group, a trifluoromethyl group, a benzyl gr
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