prov:value
| - where R represents an alkyl group, an alkoxyl group, an aryl group, an alkylaryl group or an aralkyl group and n is an integer of 2 or more, and includes, for example, o-tolylene diisocyanate, naphthylene 1,5-diisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate, xylylene diisocyanate, tris(p-isocyanatophenyl) thiophosphite, polymethylene polyphenyl diisocyanate, chlorophenyld
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