undecylenic acid
noun
un·dec·y·le·nic acid
ˌən-ˌde-sə-ˈle-nik-
-ˈlē-
: 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
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