prov:value
| - In the formula (5), R9 is hydrogen atom, an alkyl group having 1 to 10 carbon atoms such as methyl group, ethyl group, propyl group and butyl group, an alkoxyl group having 1 to 10 carbon atoms, a halogen atom, nitro group, cyano group, mercapto group, a lower alkylcarboxylate group or carboxyl group.
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