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.

Input: Consider Input: Ergovaline binding and activation of D2 dopamine receptors in GH4ZR7 cells.

Output: dopamine


Input: Consider Input: Identification of cDNAs encoding two human alpha class glutathione transferases (GSTA3 and GSTA4) and the heterologous expression of GSTA4-4.

Output: glutathione


Input: Consider Input: Nebulized arformoterol in patients with COPD: a 12-week, multicenter, randomized, double-blind, double-dummy, placebo- and active-controlled trial.


Output: arformoterol