J.-H. Bi, F.-X. Xie, X.-S. Sheng, and X.-D. Zhao, “Non-template synthesis and Characterization of 17-Membered Schiff Base Macrocycle Containing Oxygen and Nitrogen Heteroatoms and Its Metal Complexes ”, ajc, vol. 14, no. 2, pp. 821–826, Mar. 2010.