Ethyl 2-hydroxy-5-(pyridin-3-yl)isonicotinate
Ethyl 2-hydroxy-5-(pyridin-4-yl)nicotinate
Ethyl 2-hydroxy-5-(pyridin-3-yl)nicotinate
Ethyl 6-hydroxy-3-(pyridin-4-yl)picolinate
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