prov:value
| - X is a monovalent hydrolyzable group, for example, halogen atoms such as chlorine atom and bromine atom, alkoxy groups such as methoxy, ethoxy, propoxy, butoxy, methoxyethoxy and ethoxyethoxy, alkenyloxy groups such as allyloxy, propenyloxy and isopropenyloxy, acyloxy groups such as acetoxy and propionyloxy, amino groups such as dimethylamino, diethylamino, methylethylamino and butylamino, and ami
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