C3H5CO2H

Crotonic Cro*ton"ic (kr?-t?n"?k), a. Of or pertaining to, or derived from, a plant of the genus {Croton}, or from croton oil. [1913 Webster]

{Crotonic acid} (Chem.), a white crystalline organic acid, {C3H5.CO2H}, of the ethylene, or acrylic acid series. It was so named because formerly supposed to exist in croton oil. Also, any acid metameric with crotonic acid proper. [1913 Webster]

Note: The acid characteristic of croton oil is tiglic or tiglinic acid, a derivative of {crotonic acid}. [1913 Webster]