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: Influence of triterpenoids present in apple peel on inflammatory gene expression associated with inflammatory bowel disease (IBD).

Output: triterpenoids


Input: Consider Input: Localization of an 11 beta hydroxysteroid dehydrogenase activity to the distal nephron. Evidence for the existence of two species of dehydrogenase in the rat kidney.

Output: 11 beta hydroxysteroid


Input: Consider Input: Hydrogen sulfide inhibits nitric oxide production and nuclear factor-kappaB via heme oxygenase-1 expression in RAW264.7 macrophages stimulated with lipopolysaccharide.


Output: nitric oxide