| http://www.w3.org/ns/prov#value | - The present invention is directed to a compound of the formula [I]: In the above formula [I], n is an integer of 0 or 1, R1 is a hydrogen atom or a methyl group, and R2 can be selected from the following: a ???CN group; a ???COOH group; a ???(C1-6alkylene)OH group, preferably a ???(C1-3 alkylene)OH group; a CH2O(C1-6 alkyl) group, preferably a ???CH2O(C1-3 alkyl) group; a ???(C1-3 alkylene)COOH gr
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