nonanoic acid same as pelargonic acid (see under pelargonium).

pelargonium /pel-ər-gōˈni-əm/

Any plant of a vast genus (Pelargonium) of the Geraniaceae family of plants, having clusters of red, pink or white flowers, often cultivated under the name of geranium

pelargonic acid noun

An oily fatty acid, obtained esp from the leaves of plants of the Pelargonium genus (also called nonanoic acid)