The 1 H and C NMR spectra were obtained using an Ultrashield Bruker 400 MHz 54 mm long hold magnet (p/n BZH/422/400/70F) equipped with a B-ACS60 autosampler. The samples were dissolved in deuterated chloroform in concentrations of 5 mg mL -1 for 1 H NMR and 10 mg mL -1 for 13 C NMR. In both cases, a Nylon 0.45 μm syringe filter was used to remove undissolved particles. The MestReNova software (Mestrelab Research) was used to process the data and to apply a baseline correction.