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.

Example Input: Discovery of 4-phenyl-2-phenylaminopyridine based TNIK inhibitors.
Example Output: 4-phenyl-2-phenylaminopyridine

Example Input: Neuroprotective and anti-inflammatory properties of a coffee component in the MPTP model of Parkinson's disease.
Example Output: MPTP

Example Input: Adhesion of osteoblasts to a vertically aligned TiO2 nanotube surface.
Example Output:
TiO2