prov:value
| - wherein ??? represents a phenyl ring, R4 represents an alkyl group having from 1 to 4 carbon atoms such as a methyl group, ethyl group, propyl group, butyl group, or the like; alkoxy group having from 1 to 4 carbon atoms such as a methoxy group, ethoxy group, propyoxy group, butoxy group, or the like; halogen atom such as a chlorine atom, bromine atom, or the like; nitro group, cyano group, mercap
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