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: Phenformin has a direct inhibitory effect on the ATP-sensitive potassium channel.
Example Output: potassium

Example Input: Loss of Calcium/Calmodulin-Dependent Protein Kinase II Activity in Cortical Astrocytes Decreases Glutamate Uptake and Induces Neurotoxic Release of ATP.
Example Output: Glutamate

Example Input: Neuroprotection by propargylamines in Parkinson's disease: suppression of apoptosis and induction of prosurvival genes.
Example Output:
propargylamines