prov:value
| - Preferred examples of the alkyl group having from 1 to 20 carbon atoms are a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an n-octyl group, a 2-ethylhexyl group, etc.; those of the aryl group having from 6 to 20 carbon atoms, the alkylaryl group and the arylalkyl group are a phenyl group, a p-tolyl group, a benzyl group, a pentafluorophenyl group, a 3,5-di
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