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]: Hypoxemia associated with cimetidine therapy in a newborn infant.
[EX A]: cimetidine

[EX Q]: Drug-protein interactions: isolation and characterization of covalent adducts of phenoxybenzamine and calmodulin.
[EX A]: phenoxybenzamine

[EX Q]: The role of glutathione transferases M1 and T1 in individual susceptibility to bladder cancer in a Tunisian population.
[EX A]:
glutathione