Ausschnittvergrößerung mit TikZ

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\documentclass{article}
\usepackage{graphicx}% wird zwar von tikz geladen, aber...
\usepackage{tikz}    % wird zwar von chemfig geladen, aber...
\usepackage{chemfig}
% das folgende definiert eine Dekoration `complete sines', die später für die
% gewellten Linien verwendet wird (siehe
% http://tex.stackexchange.com/a/25689/5049 ):
\usetikzlibrary{decorations.pathmorphing}
\pgfdeclaredecoration{complete sines}{initial}{
  \state{initial}[
    width=+0pt,
    next state=sine,
    persistent precomputation={
      \pgfmathsetmacro\matchinglength{
        \pgfdecoratedinputsegmentlength /
        int(\pgfdecoratedinputsegmentlength/\pgfdecorationsegmentlength)
      }
      \setlength{\pgfdecorationsegmentlength}{\matchinglength pt}
    }
  ] {}
  \state{sine}[width=\pgfdecorationsegmentlength]{
    \pgfpathsine{
      \pgfpoint
        {0.25\pgfdecorationsegmentlength}
        {0.5\pgfdecorationsegmentamplitude}
    }
    \pgfpathcosine{
      \pgfpoint
        {0.25\pgfdecorationsegmentlength}
        {-0.5\pgfdecorationsegmentamplitude}
    }
    \pgfpathsine{
      \pgfpoint
        {0.25\pgfdecorationsegmentlength}
        {-0.5\pgfdecorationsegmentamplitude}
    }
    \pgfpathcosine{
      \pgfpoint
        {0.25\pgfdecorationsegmentlength}
        {0.5\pgfdecorationsegmentamplitude}
 
 
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