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.

[Q]: Activation of the anti-cancer agent upamostat by the mARC enzyme system.
[A]: upamostat


[Q]: The accumulation of metal (Co, Cr, Cu, Mn and Zn) in freshwater Ulva (Chlorophyta) and its habitat.
[A]: Mn


[Q]: Compensatory changes in enzymes of arginine metabolism during renal hypertrophy in mice.
[A]:
arginine


