Ethyl 5-(2,3-difluorophenyl)-6-hydroxynicotinate
Ethyl 5-(2,3-difluorophenyl)-2-hydroxynicotinate
Ethyl 5-(2,3-difluorophenyl)-2-hydroxyisonicotinate
Ethyl 3-(2,3-difluorophenyl)-5-hydroxyisonicotinate
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