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:
Study of the nematode putative GABA type-A receptor subunits: evidence for modulation by ivermectin.
answer:
GABA


question:
Anabolic effects of clenbuterol on skeletal muscle are mediated by beta 2-adrenoceptor activation.
answer:
clenbuterol


question:
Characterization of binding sites of a new neurotensin receptor antagonist, [3H]SR 142948A, in the rat brain.
answer:

neurotensin