Shi, Zhi-Hao, et al. “Design and Synthesis of Novel Aspirin-Caffeic Acid Ester Hybrids for Cardioprotection With Reduced Risk of Hemorrhagic Stroke”. Asian Journal of Chemistry, vol. 27, no. 4, Feb. 2015, pp. 1342-6, doi:10.14233/ajchem.2015.17896.