TASK DEFINITION: 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.
PROBLEM: Localization of the ammonium transporter proteins RhBG and RhCG in mouse kidney.

SOLUTION: ammonium

PROBLEM: Aripiprazole acts as a selective dopamine D2 receptor partial agonist.

SOLUTION: dopamine

PROBLEM: Three-Dimensional CdS-Titanate Composite Nanomaterials for Enhanced Visible-Light-Driven Hydrogen Evolution.

SOLUTION:
Hydrogen