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]: Relative expression of cholesterol transport-related proteins and inflammation markers through the induction of 7-ketosterol-mediated stress in Caco-2 cells.
[EX A]: cholesterol

[EX Q]: Cooperative effects for CYP2E1 differ between styrene and its metabolites.
[EX A]: styrene

[EX Q]: Inhibition of cardiac voltage-gated sodium channels by grape polyphenols.
[EX A]:
sodium