c
Arginine is basic amino acid
${H_2}N\, - \mathop C\limits^{\mathop {||}\limits^{NH} } - \,NH\, - \,C{H_2}\, - \,C{H_2}\, - \,\,C{H_2} - \mathop C\limits_{\mathop |\limits_H }^{\mathop |\limits^{N{H_2}} } - \,\mathop C\limits^{\mathop {||}\limits^O } - \,OH$