Cinnamic acid is a white crystalline compound with the formula C6H5CH=CHCOOH which is slightly soluble in water, and freely soluble in many organic solvents. It exists as trans and cis isomers, but the trans form is the one most often found in nature and is widely used in commerce. Trans-Cinnamic acid is very important because it is widely used in perfume, food, photographic, polymer and pharmaceutical industries. Landmark provides both cis-cinnamic acid(CAS NO. 621-82-9) and trans-cinnamic acid(CAS NO. 140-10-3).