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1H-NMR analysis of CysMA (500 MHz). The CysMA monomer was synthesized using a selective Thia–Michael addition in an aqueous solution at 20 °C. (A) CysMA structure. (B) The CysMA 1H-NMR spectra. (400.13 MHz, D2O, 298 K) δ (ppm): [A] 1.89 (s, 3H, -CH3); [B] 2.68–3.17 (m, 6H, -S-CH2-CH2-COO-, -S-CH2-CH(COO-)NH3+); [C] 3.79 (m, IH, CHOH); [D] 3.90 (m, 1H, -CH(COO-) NH3+); [E] 4.20–4.30 (m, 4H, -CH2-CHOH-CH2-); [F] 5.70 (s, 1H, vinyl); and [G] 6.13 (s 1H, vinyl).
