Kemija - 2017. ljeto, 22.

${\mathrm{C}\mathrm{H}}_3\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}\backslash mathrm\{CH\}\_\{3\}\; \backslash mathrm\{COOH\}$

${\mathrm{C}\mathrm{H}}_3{\mathrm{O}\mathrm{C}\mathrm{H}}_3\backslash mathrm\{CH\}\_\{3\}\; \backslash mathrm\{OCH\}\_\{3\}$

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

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