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.

Input: Consider Input: Effect of cyproheptadine on serum leptin levels.

Output: cyproheptadine


Input: Consider Input: Orexin-A suppresses postischemic glucose intolerance and neuronal damage through hypothalamic brain-derived neurotrophic factor.

Output: glucose


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


Output: sodium