In this task, you are given a sentence. You are expected to recognize the name of any form of chemical substances. Although there might be several correct answers, you need to write one of them.

[Q]: Discovery of 4-phenyl-2-phenylaminopyridine based TNIK inhibitors.
[A]: 4-phenyl-2-phenylaminopyridine

[Q]: Characterization of binding sites of a new neurotensin receptor antagonist, [3H]SR 142948A, in the rat brain.
[A]: neurotensin

[Q]: Impaired expression of the uncoupling protein-3 gene in skeletal muscle during lactation: fibrates and troglitazone reverse lactation-induced downregulation of the uncoupling protein-3 gene.
[A]:
troglitazone