prov:value
| - mino group, a hydroxyl group, a mercapto group, a halogen atom (e.g., a fluorine atom, a chlorine atom, a bromine atom and an iodine atom) and a carboxyl group; more preferably an aryl group, an alkoxy group, an aryloxy group, a hydroxyl group and a halogen atom; even more preferably an alkoxy group and a hydroxyl group; and particularly preferably a hydroxyl group.), N and P???O. X is more prefer
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