prov:value
| - Examples of the optionally substituted aralkyl group for R1 to R4 include benzyl group, phenethyl group, naphthylmethyl group, pyrenylmethyl group, anthranenylmethyl group and the like, and the substituent thereof includes, for example, a halogen atom such as fluorine, chlorine, bromine, etc., cyano group, benzoyl group, alkyl group, a halogenated alkyl group such as trifluoromethyl, an optionally
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