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.

Example Input: Aspirin inhibits mTOR signaling, activates AMP-activated protein kinase, and induces autophagy in colorectal cancer cells.
Example Output: mTOR

Example Input: Green tea catechin leads to global improvement among Alzheimer's disease-related phenotypes in NSE/hAPP-C105 Tg mice.
Example Output: catechin

Example Input: Carnitine biosynthesis. Purification of gamma-butyrobetaine hydroxylase from rat liver.
Example Output:
gamma-butyrobetaine