$C{H_3}{\mkern 1mu}  - {\mkern 1mu} \mathop {{\text{ }}N}\limits^{ \bullet  \bullet } {\mkern 1mu} H{\mkern 1mu}  - {\mkern 1mu} \mathop {{\text{ }}C}\limits^{\mathop {||}\limits^O } {\mkern 1mu}  - {\mkern 1mu} H{\mkern 1mu}  \leftrightarrow {\mkern 1mu} C{H_3} - \mathop {{\text{ }}N}\limits^ \oplus  H{\mkern 1mu}  = {\mkern 1mu} {\mkern 1mu} \mathop {{\text{ }}C}\limits^{\mathop {{\text{ }}|}\limits^{\,\,\,\,\,\,{O^{ - 1}}} }  - H$