\documentstyle[m-chemie]{article}


\definieerchemie[sixring] 
  {\chemie[SIX,B,R,RZ135][R_1,R_2,R_3]}

\startchemie               
  \chemie[sixring,SIX,RZ246][A,B,C,X,Y,Z] 
\stopchemie


\definieerchemie[sixring] 
  {\chemie[SIX,B,R,RZ135]}

\startchemie               
  \chemie[sixring,RZ246][R_1,R_2,R_3,A,B,C] 
\stopchemie


\definieerchemie[sixring] 
  {\chemie[SIX,B,R,RZ][R_1,R_2,R_3]}

\startchemie               
  \chemie[sixring][A,B,C] 
\stopchemie


\startbuffer
\definieerchemie[blok]
  {\chemie
     [ONE,Z0,SB1357,
      SAVE,SUB2,SIX,B,R6,C,RESTORE,
      MOV1,Z0,SB137,
      MOV1,Z0,SB37,
      MOV1]
     [C,C,C]}

$$
\startchemie[hoogte=passend,breedte=passend]
  \chemie[blok,blok]
\stopchemie
$$


$$
\stelchemiein[breedte=passend,boven=2000,onder=2000,assenstelsel=aan]
\startchemie
  \chemie[ONE,
          SAVE,Z0,2OFF1,SB7,SB3,SB1,MOV1,Z0,SB1,MOV1,Z0,DB8,CZ8,SB1,Z1,RESTORE,
          SAVE,SUB4,ONE,Z0,2OFF1,SB3,SB1,MOV1,Z0,SB1,MOV1,Z0,DB8,CZ8,SB1,Z1,RESTORE,
          SUB2,ONE,Z0,2OFF1,SB7,SB1,MOV1,Z0,SB1,MOV1,Z0,DB8,CZ8,SB1,Z1]
          [HC,O,C,O,C_{19}H_{39},
           H_{2}C,O,C,O,C_{17}H_{29},
           H_{2}C,O,C,O,C_{21}H_{41}]
\stopchemie
\startchemie
  \chemie[SPACE,PLUS,SPACE]
\stopchemie
\startchemie[rechts=1000]
  \chemie[ONE,CZ0][3CH_{3}OH]
\stopchemie
\startchemie
  \chemie[SPACE,GIVES,SPACE]
\stopchemie
\startchemie
  \chemie[ONE,
          SAVE,Z0,2OFF1,SB7,SB3,SB1,Z1,RESTORE,
          SAVE,SUB4,ONE,Z0,2OFF1,SB3,SB1,Z1,RESTORE,
          SUB2,ONE,Z0,2OFF1,SB7,SB1,Z1]
          [HC,OH,
           H_{2}C,OH,
           H_{2}C,OH]
\stopchemie
\startchemie
  \chemie[SPACE,PLUS,SPACE]
\stopchemie
\startchemie
  \chemie[ONE, 
          SAVE,Z0,DB8,CZ8,SB1,SB5,Z5,MOV1,Z0,SB1,Z1,RESTORE,
          SAVE,SUB4,ONE,Z0,DB8,CZ8,SB1,SB5,Z5,MOV1,Z0,SB1,Z1,RESTORE,
          SUB2,ONE,Z0,DB8,CZ8,SB1,SB5,Z5,MOV1,Z0,SB1,Z1]
         [C,O,C_{19}H_{39},O,CH_{3},
          C,O,C_{17}H_{29},O,CH_{3},
          C,O,C_{21}H_{49},O,CH_{3}]
\stopchemie
$$

$$
\stelchemiein[breedte=passend,boven=3000,onder=3000,assenstelsel=aan]%
\eqalign
  {
    \startchemie
      \chemie[ONE,Z0,DB1,SB3,SB7,Z7,MOV1,Z0,SB3,SB7,Z3,Z7,
              MOV0,SUB2,SIX,B,R6,C]
             [C,H,C,H,H]
    \stopchemie
    \quad\quad\quad
  &
    \startchemie
      \chemie[ONE,Z0,DB1,SB3,SB7,Z3,Z7,
              MOV1,Z0,SB1,SB3,Z3,
              MOV1,Z0,DB1,SB3,Z3,
              MOV1,Z0,SB3,SB7,Z3,Z7]
             [C,H,H,C,H,C,H,C,H,H]
    \stopchemie
  \cr
    \rm styreen
    \quad\quad\quad
  &
    \rm 1,3-butadieen
  }
$$

\end{document}