You know what it looks like… but what is it called?
TAKE THE QUIZ“undecylenic”
We have one entry that includes the term undecylenic.
undecylenic acid
noun: a fatty acid C11H20O2 found in perspiration, obtained commercially from castor oil, and used especially in the treatment of fungal infections (such as ringworm) of the skin
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Merriam-Webster unabridged