| http://www.w3.org/ns/prov#value | - nted by the formula: wherein Y is R, SR, ZH, ZMe, NR'R, halogen or hydrogen in which Z is oxygen or sulfur, R is a hydrocarbon or halohydrocarbon radical having 1 to 20 carbon atoms, R and R each is hydrogen or a hydrocarbon radical having 1 to 20 carbon atoms including a case in whic
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