instruction:
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.
question:
Localization of the ammonium transporter proteins RhBG and RhCG in mouse kidney.
answer:
ammonium


question:
A novel membrane sensor for histamine H1-receptor antagonist "fexofenadine".
answer:
histamine


question:
Cereblon is a direct protein target for immunomodulatory and antiproliferative activities of lenalidomide and pomalidomide.
answer:

lenalidomide