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:
The role of glutathione transferases M1 and T1 in individual susceptibility to bladder cancer in a Tunisian population.

Ex Output:
glutathione


Ex Input:
Thalidomide prevents alcoholic liver injury in rats through suppression of Kupffer cell sensitization and TNF-alpha production.

Ex Output:
alcoholic


Ex Input:
Inhibition of EGF/EGFR activation with naphtho[1,2-b]furan-4,5-dione blocks migration and invasion of MDA-MB-231 cells.

Ex Output:

naphtho[1,2-b]furan-4,5-dione