Sometimes the answer is simple: give it a good connection point. 4-Pyridazinecarboxylic acid contains a pyridazine ring—a six-membered aromatic ring with two neighboring nitrogen atoms—and one carboxylic acid.
The two parts do different jobs. The pyridazine ring provides shape, polarity and two nitrogen atoms that can influence how a larger molecule interacts with a biological target. The carboxylic acid provides chemistry.
Global Chemical Database