prov:value
| - Where, m denotes an integer of 1 or 2, preferably 2: R1 denotes an aromatic hydrocarbon group, particularly, an aryl group of 6 to 30, preferably 6 to 20 carbon atoms such as phenyl, benzyl, naphthyl, biphenyl, terphenyl, phenanthryl, anthryl, or the like; and an alkyl-substituted aryl group such as tolyl, iso-propylphenyl, tert-butylphenyl, dimethylphenyl, di-tert-butylphenyl, or the like.
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