2.5. Spectroscopic characterization
Spectroscopy analysis by13C NMR was carried out. A mix of700 L of deuterated chloroform with 50 mg of pure compound was used for identification. The assay was developed at 22◦C usingtetramethylsilane (TMS) as an internal reference.13C signals were acquired under standard conditions, and the NMR spectrum wasrecorded at high resolution on a 200 MHz Varian Mercury Spec-trometer (Palo Alto, CA, USA).