1H and 13C NMR spectra were logged with JEOL 400 MHZ, Bruker 500 Hz, and 125 Hz NMR spectrophotometers. Deuterated chloroform was used as the base solvent. Chemical shifts were recorded (as particle per million) regarding tetramethylsilane as the internal reference standard. A high-resolution mass spectrum was obtained using a Bruker microTOF QII mass spectrophotometer.
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