| http://www.w3.org/ns/prov#value | - wherein X1 represents a lower alkoxy group Y1 represents a ligand derived from a compound selected from the group consisting of M1 COCH2COOM2 and M3COCH2COOM4 where M1, M2, M3 and M4 independently represent a lower alkyl group, and n is an integer of 0 to 2,
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