| http://www.w3.org/ns/prov#value | - eferred and its example is a complex compound represented by the following formula (5). ##STR1##(In the formula, R.sup.10 to R.sup.14 each independently is a hydrogen atom or a hydrocarbon group having 1-20 carbon(s) and they may bond each other forming a ring; R.sup.15 and R.sup.16 each independently is an aliphatic hydrocarbon grouphaving 1-20 carbon(s) or an aromatic group having a hydrocarbon
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