\documentclass[a4paper,12pt]{report}
\usepackage{german,ochem}
\begin{document}

\begin{chemistry}[bsp1]
multiline(1,L)
{ formula(L,R,"(E)-Buten-2")
  { atom("H$_3$C",R,R)
    bond(30; -30,=; 30) atom("CH$_3$",L)
  }
  space(R)
  formula(L,R,"Essigs""aure")
  { atom("H$_3$C",R,R) bond(0)
    branch{ bond(45,=C) atom("O",L);
            bond(-45) atom("O",C,L) atom("H",L);
            atom("C");
          }
  }
  space(R)
  formula(L,R,"Cumarin")
  { ring(){ 5: ring(,1,H)
               { 3: atom("O");
                 4: bond(30,=C) atom("O");};
          }
  }
  space(R)
  formula(L,R)
  { ring(,,H,,4,-45)
    { 0: bond(30,<.) atom("Br",L);
      0: bond(-60,<<) atom("OH",L);
    }
  };
}
\end{chemistry}


\end{document}