| http://www.w3.org/ns/prov#value | - Examples of Z1 to Z9 include a hydrogen atom, a halogen atom such as a fluorine atom, a chlorine atom or a bromine atom, a methyl group, a hydroxy group, a methoxy group, a cyano group, or Z1, Z2 or Z3 may be connected to R2 or R3 to form a nitrogen containing ring as in the case where ##STR19## represents ##STR20## or Z1 and Z2, Z4 and Z5 or Z7 and Z8 may be connected to each other to form a part
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