Kemija - 2018. ljeto, 22.

${\mathrm{N}}_2\backslash mathrm\{N\}\_\{2\}$

${\mathrm{N}\mathrm{H}}_3\backslash mathrm\{NH\}\_\{3\}$

${\mathrm{C}\mathrm{H}}_3{\mathrm{N}\mathrm{H}}_2\backslash mathrm\{CH\}\_\{3\}\; \backslash mathrm\{NH\}\_\{2\}$

${\mathrm{C}\mathrm{H}}_3{\mathrm{C}\mathrm{O}\mathrm{N}\mathrm{H}}_2\backslash mathrm\{CH\}\_\{3\}\; \backslash mathrm\{CONH\}\_\{2\}$