prov:value
| - The above aryl group may have a substituent which includes, e.g., halogen atoms, alkyl groups, alkoxy groups, hydroxyl groups, hydroxycarbonyl group, and the like. ##STR6## wherein R12, R13, R14, R15 and R16 each is a hydrogen atom, a halogen atom, a sulfonic acid group (including a salt thereof) or a monovalent organic group, provided that at least one of the R12, R14 and R15 is a hydroxyl group
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