\vbox{ \centerline{ \structure{\longerewbonds\phantatom{H}\swphantom\atom{N} \side{\sseabove\atom{H}} \side{\sebelow\atom{H}}\nnesingle\atom{C} \side{\nnwabove\atom{H}}\side{\nwbelow\atom{H}} \esingle\atom{C}\side{\ssedouble\atom{O}} \nnesingle\atom{O}\esingle\atom{H}} \hskip 1cm{$\rightleftharpoons$}\hskip 1cm \structure{\longerewbonds\phantatom{H}\swphantom\atom{N} \side{\sseabove\atom{H}}\side{\sebelow\atom{H}} \nnesingle\atom{C}\side{\nnwabove\atom{H}} \side{\nwbelow\atom{H}}\esingle\atom{C}\side{\nnedouble\atom{O}} \ssesingle\atom{O}\esingle\atom{H}} } \medskip \centerline{\bf Figure~10. \rm Two conformeres of neutral glycine in equilibrium.} }