prov:value
| - Further, among the above alkyl groups which may be substituted, preferred is an alkyl group which may be substituted by a substituent selected from the group consisting of a halogen atom, a hydroxyl group, 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 hydroxyethyl group, a carboxymethyl group, a carboxyethyl gro
|