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: Liver X Receptors and female reproduction: when cholesterol meets fertility!
Example Output: cholesterol

Example Input: Aspirin and salicylate bind to immunoglobulin heavy chain binding protein (BiP) and inhibit its ATPase activity in human fibroblasts.
Example Output: salicylate

Example Input: On the relationship between the dopamine transporter and the reinforcing effects of local anesthetics in rhesus monkeys: practical and theoretical concerns.
Example Output:
dopamine