Cinnamic acid

Cinnamic acid is an organic compound with the formula C₆H₅CHCHCO₂H. It is a white crystalline compound that is slightly soluble in water, and freely soluble in many organic solvents. Classified as an unsaturated carboxylic acid, it occurs naturally in a number of plants. It exists as both a cis and a trans isomer, although the latter is more common.