| 摘要 |
Methods of preparing compounds of formula i(1): or a pharmaceutically acceptable salt thereof, wherein: R1 and R2 join together with the nitrogen atom to which they are attached form a 6 membered heterocycloalkyl group; X1 is H, Br, Cl or F; X2 is H, Br, Cl or F; s is 2-6; n1 is 1-2; and n2 is 1-2.
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