\documentclass{report}
\usepackage{german}
\usepackage[separate]{ochem}
\begin{document}

\begin{chemistry}
  formula(L,R,"Indigo",HR,24)
  {
    ring(,,H,,5,0){
      vertex(,2){};
      0: bond(r,=C,L) ring(,0,H,,5,r){
                       vertex(,2){};
                       1: atom("N") bond(r) atom("H");
                       4: bond(r,=C) atom("O");
                     };
      1: atom("N") bond(r) atom("H");
      4: bond(r,=C) atom("O");
    }
  }
\end{chemistry}

\begin{chemistry}
  formula(L,R,"\shortstack{6,6'-Dibrom-indigo\\Purpur}",HR,24)
  {
    ring(,,H,,5,0){
      vertex(,2){ 3: bond(r) atom("Br"); };
      0: bond(r,=C,L) ring(,0,H,,5,r){
                       vertex(,2){ 3: bond(r) atom("Br"); };
                       1: atom("N") bond(r) atom("H");
                       4: bond(r,=C) atom("O");
                     };
      1: atom("N") bond(r) atom("H");
      4: bond(r,=C) atom("O");
    }
  }
\end{chemistry}

\begin{chemistry}
  formula(L,R,"Carmins""aure",HR,24)
  { ring(,,H){
      vertex(,1,4){ 0: bond(r,,Ln) atom("C",C,R) atom("OOH",L); 
                     1: bond(r) atom("O",C,L) atom("H",R);
                     3: bond(r) atom("C",C,R) atom("H$_3$",L);
                   };
      vertex(,4,1){ 0: bond(r) atom("O",C,R) atom("H",L);
                     3: bond(r) atom("O",C,R) atom("H",L);
                     4: bond(r) atom("CO(CHOH)$_4$CH$_3$",L);
                     5: bond(r) atom("O",C,R) atom("H",L);
                   };
      0: bond(r,=C) atom("O");
      3: bond(r,=C) atom("O");
    }
  }
\end{chemistry}

\end{document}