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: Biosynthesis of selenocysteine on its tRNA in eukaryotes.

Output: selenocysteine


Input: Consider Input: Determination of dimethylarginine dimethylaminohydrolase activity in the kidney.

Output: dimethylarginine


Input: Consider Input: Decreased histamine H1 receptor binding in the brain of depressed patients.


Output: histamine