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.

Q: Intrauterine pressure, ischemia markers, and experienced pain during administration of a vasopressin V1a receptor antagonist in spontaneous and vasopressin-induced dysmenorrhea.

A: vasopressin
****
Q: Monoamine transporter and sodium channel mechanisms in the rapid pressor response to cocaine.

A: sodium
****
Q: Doxorubicin decreases paraquat accumulation and toxicity in Caco-2 cells.

A:
paraquat
****