\startTEXpage

\ruledhbox\bgroup
    \startMPcode{chemistry}
        chem_start_structure(
            1,     %  numeric : structures
            0,     %  numeric : left
            0,     %  numeric : right
            0,     %  numeric : top
            0,     %  numeric : bottom
            0,     %  numeric : rotation
            11pt,  %  numeric : unit
            2,     %  numeric : bondlength
            1,     %  numeric : scale
            0,     %  numeric : offset
            true,  %  boolean : axis,
            .6pt,  %  numeric : rulethickness
            "red"    %  color   : axiscolor
        ) ;
        chem_start_component ;
        chem_set(one) ;
        chem_b(one,1,8,0.6pt,(0,0,0));
        chem_stop_component ;
        chem_stop_structure ;
    \stopMPcode
\egroup

\ruledhbox\bgroup
    \startchemical
        \chemical[SIX,B,R]
    \stopchemical
\egroup

\stopTEXpage
