| http://www.w3.org/ns/prov#value | - Examples of Y are a di-, tri- or tetra-valent C10-18 condensed polycyclic ring, such as a naphthalene ring and an anthracene ring; a di-, tri- or tetra-heterocyclic ring derived from pyridine and imidazole and the groups represented by the following formulae ##STR8## wherein Y1 and Y2 each is a hydrogen atom, --CH3, --C2 H5, --CH(CH3)2, --OCH3, --COOH, --NO2, --CONH2, --NH2, a halogen atom or --SO
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