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 Input:
Use of tranexamic acid for an effective blood conservation strategy after total knee arthroplasty.

Ex Output:
tranexamic acid


Ex Input:
Design, Synthesis and biological evaluation of catecholamine vehicle for studying dopaminergic system.

Ex Output:
catecholamine


Ex Input:
Role of quercetin in cadmium-induced oxidative stress, neuronal damage, and apoptosis in rats.

Ex Output:

quercetin