“…The IR spectra of 3a,b,c show N-H stretching bands at 3377, 3374, 3379 cm -1 and O-H stretching bands at 3146, 3161, 3170 cm -1 (broad), respectively. The structures of 3a-c were confirmed by nmr spectroscopic data that agree with those found for the similar compounds [2,3,9,17]. In the 1 H nmr spectra of 3a, 3b and 3c the characteristic shifts of CH 3 protons adjacent to the ring at 1.86, 1.84, 1,84 ppm, CH 3 C=O protons at 2.46, 2.49, 2.48 ppm, NH protons 7.27, 7.25, 7.29 were observed, respectively.…”