CPC C07D 403/12 (2013.01) [C07B 2200/05 (2013.01)] | 11 Claims |
1. The compound represented by formula (I), or an optical isomer thereof, or a salt thereof:
wherein, each of R1-R7, R9, and R10 is independently selected from H and D; A is selected from the group consisting of CH and CD; B is N; X and Y are each independently selected from the group consisting of Cl and Br; X and Y are not Cl at the same time.
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