\documentclass{article}
%\usepackage{pstricks,pstcol,pst-plot}
\usepackage{m-pictex,color}
\usepackage{m-ch-de}
 
\begin{document}
 
% C3-Aldose, Bindungen der Aldehydgruppe rot \startchemical
\startchemie
  {\color{red}{\chemie[SIX,SB2,DB3]}}
  \chemie[SIX,Z234,SUB2,ONE,Z015,SB1,SB3,SB5,SB7,%
         MOV3,Z0][H,C,O,C,OH,H,\SL{CH_2OH}]
\stopchemie
 
% C3-Aldose, Atome der Aldehydgruppe rot \startchemical
\startchemie
  \chemie[SIX,SB2,DB3]%
  {\color{red}{\chemie[SIX,Z234][H,C,O]}}
  \chemie[SIX,SUB2,ONE,Z015,SB1,SB3,SB5,SB7,%
          MOV3,Z0][C,OH,H,\SL{CH_2OH}]
\stopchemie
\end{document}