Ethyl 2-chloro-3-(3,4-dichlorophenyl)isonicotinate
Ethyl 2-chloro-6-(3,4-dichlorophenyl)isonicotinate
Ethyl 6-chloro-2-(3,4-dichlorophenyl)nicotinate
Ethyl 5-chloro-2-(3,4-dichlorophenyl)isonicotinate
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