prov:value
| - wherein Xd is halogen (fluorine, chlorine, bromine, iodine), L1 is a leaving group (for example, halogen (fluorine, chlorine, bromine, iodine), trifluoromethanesulfonyloxy group and the like) or a hydroxy group, R1l is C1-4alkyl, and the other symbols are the same as defined above.
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