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.

Monoamine transporter and sodium channel mechanisms in the rapid pressor response to cocaine.
sodium

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

The (R)-omeprazole hydroxylation index reflects CYP2C19 activity in healthy Japanese volunteers.

(R)-omeprazole