| 摘要 |
The present invention provides a compound represented by formula (I): wherein n is an integer selected from 1 to 20, Q is A is cyano or the like; B is hydrogen, halogen, or the like; X1 and X2 are each independently selected from O and S; E is a C1-4 alkyl group; and R1, R2, R3 and R4 are each independently selected from a hydrogen atom and a C1-C6 alkyl group, and a drug, a pharmaceutical composition containing the compound, and the like.
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