prov:value
| - may be a halogen atom (e.g., chlorine, bromine, iodine), a lower alkylsufonyloxy group (e.g., methanesulfonyloxy), and an arylsulfonyloxy group (e.g., benzenesulfonyloxy, p-toluenesulfonyloxy), and a halogen atom, especially a chlorine atom, or methanesulfonyloxy and p-toluenesulfonyloxy are more preferable.
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