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.

Ex Input:
Localization of the ammonium transporter proteins RhBG and RhCG in mouse kidney.

Ex Output:
ammonium


Ex Input:
Non-enzymatic interactions of glyoxylate with lysine, arginine, and glucosamine: a study of advanced non-enzymatic glycation like compounds.

Ex Output:
glyoxylate


Ex Input:
Two new C-15 enolic acyl phragmalin-type limonoids from Chukrasia tabularis var. velutina.

Ex Output:

limonoids