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: Efficient induction of apoptosis in HeLa cells by a novel cationic porphycene photosensitizer.
Example Output: porphycene

Example Input: Clinical assessment of norepinephrine transporter blockade through biochemical and pharmacological profiles.
Example Output: norepinephrine

Example Input: The preventive effect of uncarboxylated osteocalcin against free fatty acid-induced endothelial apoptosis through the activation of phosphatidylinositol 3-kinase/Akt signaling pathway: Uncarboxylated osteocalcin and endothelial apoptosis.
Example Output:
phosphatidylinositol

