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: Doxorubicin decreases paraquat accumulation and toxicity in Caco-2 cells.
Example Output: paraquat

Example Input: Methylation-mediated silencing of genes is not altered by selenium treatment of prostate cancer cells.
Example Output: selenium

Example Input: Global target profile of the kinase inhibitor bosutinib in primary chronic myeloid leukemia cells.
Example Output:
bosutinib