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: Reinforcement enhancing effects of nicotine via smoking.

SOLUTION: nicotine

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

SOLUTION: ammonium

PROBLEM: Pharmacodynamics and pharmacokinetics of phenylbutazone in calves.

SOLUTION:
phenylbutazone