An unknown compound was found to have the following spectral data: M+ = 206 and 208 in a 1:1 ratio. IR: 3000-2850 cm '; 1705 cm 1 'H NMR: 1.3 ppm (3H, t); 1.6 ppm (9H, s); 2.2 ppm (2H, q); 4.8 ppm (IH, s) 13C NMR: 6 total signals: 18 ppm, 21 ppm, 31 ppm, 39 ppm, 56 ppm, 190 ppm (3) 1) What does the 13C peak at 56 ppm indicate based on the formula you deduced