Xu, Chang-Jiang, et al. “Design, Synthesis and Biological Evaluations of Novel Conjugates of Danshensu, Tetramethylpyrazine and Hydrogen Sulfide Donors As Cardioprotective Agents”. Asian Journal of Chemistry, vol. 28, no. 11, Aug. 2016, pp. 2555-61, doi:10.14233/ajchem.2016.20101.