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: In vivo activity of the potent oxytocin antagonist on uterine activity in the rat.
Example Output: oxytocin

Example Input: The Fer tyrosine kinase is important for platelet-derived growth factor-BB-induced Stat3 phosphorylation, colony formation in soft agar and tumor growth in vivo.
Example Output: tyrosine

Example Input: Exploring the Interplay Between Ligand Derivatisation and Cation Type in the Assembly of Hybrid Polyoxometalate Mn-Andersons.
Example Output:
Polyoxometalate