A${C_6}{H_5}\, - \,\,\mathop C\limits_{\mathop {||}\limits_O } \,\, - \,\,NH\,\, - \,\,C{H_3},$
$C{H_3}\, - \,\,\mathop C\limits_{\mathop {||}\limits_O } \,\, - \,\,NH\,\, - \,\,{C_6}{H_5}$
$({{\text{C}}_{\text{6}}}{{H}_{5}}-\underset{\underset{O}{\mathop{||}}\,}{\mathop{C}}\,-NH-C{{H}_{3}}\,\,\,\,\And \,\,C{{H}_{3}}-\underset{\underset{O}{\mathop{||}}\,}{\mathop{C}}\,-NH-{{C}_{6}}{{H}_{5}})$ અને $({{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}\text{-}\underset{\underset{\text{O}}{\mathop{\text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}\,\text{-O-}\underset{\underset{\text{O}}{\mathop{\text{ }\!\!|\!\!\text{ }\!\!|\!\!\text{ }}}\,}{\mathop{\text{C}}}\,\text{-}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}\text{ }\,\,\text{ }\!\!\And\!\!\text{ }\,\,\text{C}{{\text{H}}_{\text{3}}}-\underset{\underset{O}{\mathop{||}}\,}{\mathop{C}}\,-O-\underset{\underset{O}{\mathop{||}}\,}{\mathop{C}}\,-{{C}_{3}}{{H}_{7}})$
બંને યુગ્મ ચલરૂપક્તા દર્શાવે છે