6-Bromo-4-chloropyrrolo[1,2-b]pyridazine-3-carboxylic acid
4,6-Dichloropyrrolo[1,2-b]pyridazine-3-carboxylic acid
4-Chloro-6-fluoropyrrolo[1,2-b]pyridazine-3-carboxylic acid
Ethyl 4-chloro-6-fluoropyrrolo[1,2-b]pyridazine-3-carboxylate
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