prov:value
| - In the formula (I), R1 and R2 each independently represents a hydroxyl group, a nitro group, a carboxyl group, a sulfamoyl group, a carbamoyl group, a phenylsulfamoyl group, or a phenylcarbamoyl group; a halogen atom such as a fluorine atom, chlorine atom, bromine atom, or iodine atom; a C1-C6 alkyl group such as a methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl
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