prov:value
| - independently of the other, is a hydrogen atom, a fluorine atom, an alkyl group, or a phenyl group, n is an integer of 0, 1, 2, 3, or 4, and R5 is an alkyl group, an aryl group, an arylalkyl group, an alkylaryl group, or a substituent other than an alkyl, aryl, arylalkyl, or alkylaryl group which is a halogen atom, an imine group, an ammonium group, a cyano group, a pyridinium group, an ether gro
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