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.

[EX Q]: Manipulation of kinetic profiles in 2-aryl propionic acid cyclooxygenase inhibitors.
[EX A]: 2-aryl propionic acid

[EX Q]: Methylation-mediated silencing of genes is not altered by selenium treatment of prostate cancer cells.
[EX A]: selenium

[EX Q]: Induction of heparin-binding EGF-like growth factor and activation of EGF receptor in imatinib mesylate-treated squamous carcinoma cells.
[EX A]:
imatinib