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: Activation of the anti-cancer agent upamostat by the mARC enzyme system.

Output: upamostat


Input: Consider Input: Maqui berry (Aristotelia chilensis) and the constituent delphinidin glycoside inhibit photoreceptor cell death induced by visible light.

Output: delphinidin glycoside


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


Output: histamine