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.

Input: Consider Input: Demonstration of histamine receptors on human platelets by flow cytometry.

Output: histamine


Input: Consider Input: In vivo activity of the potent oxytocin antagonist on uterine activity in the rat.

Output: oxytocin


Input: Consider Input: Mechanistic Aspects of hSOD1 Maturation from the Solution Structure of Cu(I) -Loaded hCCS Domain 1 and Analysis of Disulfide-Free hSOD1 Mutants.


Output: Cu(I)