8-(3-(三氟甲基)吡啶-2-基)-1,4-二噁-8-氮杂螺[4.5]癸烷

8-(3-chloropyridin-2-yl)-1,4-dioxa-8-azaspiro[4.5]decane

8-(3-fluoropyridin-2-yl)-1,4-dioxa-8-azaspiro[4.5]decane

1-(3-fluoropyridin-2-yl)piperidin-4-one