%\input struct.def
\def\ssephantom{\halfbAck\sAve{{\structsy n}}\phAntbox%
\adjUstsse\raise\vposition\box0\postadjUstsse}%
\def\ssesingle{\ssegenerAl{{\structsy n}}}%
\def\ssedouble{\halfbAck\sAve{{\structsy n}}\adjUstsse%
\advance\vposition\ptzEro3\onEm\kern\ptzEro9\thrEm%
\raise\vposition\copy0\advance\vposition-\ptzEro6\twOem%
\kern-\wd0\kern-\ptOne8\sIxem\raise\vposition\box0\kern\ptzEro9\thrEm%
\advance\vposition\ptzEro3\onEm\postadjUstsse}%
\def\ssetriple{\halfbAck\sAve{{\structsy n}}\adjUstsse%
\advance\vposition\ptzEro6\twOem\kern\ptOne8\sIxem%
\raise\vposition\copy0%
\advance\vposition-\ptzEro6\twOem\kern-\wd0\kern-\ptOne8\sIxem%
\raise\vposition\copy0\advance\vposition-\ptzEro6\twOem\kern-\wd0%
\kern-\ptOne8\sIxem\raise\vposition\box0\kern\ptOne8\sIxem%
\advance\vposition\ptzEro6\twOem\postadjUstsse}%
\def\nnwphantom{\halfbAck\sAve{{\structsy n}}\phAntbox%
\adjUstnnw\raise\vposition\box0\postadjUstnnw}%
\def\nnwsingle{\nnwgenerAl{{\structsy n}}}%
\def\nnwdouble{\halfbAck\sAve{{\structsy n}}\adjUstnnw%
\advance\vposition\ptzEro3\onEm\kern\ptzEro9\thrEm%
\raise\vposition\copy0\advance\vposition-\ptzEro6\twOem%
\kern-\wd0\kern-\ptOne8\sIxem\raise\vposition\box0\kern\ptzEro9\thrEm%
\advance\vposition\ptzEro3\onEm\postadjUstnnw}%
\def\nnwtriple{\halfbAck\sAve{{\structsy n}}\adjUstnnw%
\advance\vposition\ptzEro6\twOem\kern\ptOne8\sIxem%
\raise\vposition\copy0%
\advance\vposition-\ptzEro6\twOem\kern-\wd0\kern-\ptOne8\sIxem%
\raise\vposition\copy0\advance\vposition-\ptzEro6\twOem\kern-\wd0%
\kern-\ptOne8\sIxem\raise\vposition\box0\kern\ptOne8\sIxem%
\advance\vposition\ptzEro6\twOem\postadjUstnnw}%
\def\structure#1{\hbox{\let\normalbf\bf\let\bf\structbf%
\structrm\dimendef\em250\em1em%
\dimen252\fontdimen2\structrm\fontdimen2\structrm\zEro%
\dimen253\fontdimen3\structrm\fontdimen3\structrm\zEro%
\dimen254\fontdimen4\structrm\fontdimen4\structrm\zEro%
\dimen255\fontdimen7\structrm\fontdimen7\structrm\zEro%
\countdef\esemarker43\countdef\wswmarker53\countdef\enemarker63%
\countdef\wnwmarker73\countdef\nemarker83\countdef\nwmarker93%
\dimendef\stroke251%
\shorterewbonds\nemarker0\nwmarker0\countdef\backflag23%
\countdef\sidenesting11\countdef\aromatcount20%
\countdef\chelpone42\countdef\chelptwo52\countdef\chelpthree62%
\countdef\chelpfour72\countdef\chelpfive32\countdef\chelpsix22%
\countdef\chelpeight12\countdef\cone21\countdef\ctwo31%
\countdef\cthree41\let\ifnoprint\iftrue\let\ifprint\iffalse%
\sidenesting0\backflag0\aromatcount0\dimendef\hposition0%
\dimendef\vposition1\dimendef\maxhposition2\dimendef\hsidecorr4%
\dimendef\minhposition3\dimendef\lasthtdp5\dimendef\lastwd6%
\dimendef\waromat7\dimendef\naromat8\dimendef\earomat9%
\dimendef\saromat10\dimendef\helpone12\dimendef\helptwo13%
\dimendef\helpthree22\dimendef\helpfour23\dimendef\helpfive32%
\dimendef\helpsix33\dimendef\helpseven42\dimendef\helpeight52%
\hposition\baselineskip\advance\hposition-.\sEvem%
\advance\baselineskip-.\thrEm\count33\hposition% depth to be added
\hposition\zEro\vposition\hposition\maxhposition\hposition%
\minhposition\hposition\hsidecorr\hposition\lasthtdp\hposition%
\lastwd\hposition\waromat\hposition\naromat\hposition%
\earomat\hposition\saromat\hposition#1\ifnoprint\kern-\hposition%
\kern-\minhposition\hposition\zEro\vposition\hposition%
\maxhposition\hposition\shorterewbonds\nopositioncheck#1\fi%
\kern-\hposition\kern\maxhposition%
\ifnum\aromatcount>0\messAge{\aromatIgnored}\fi%
\fontdimen2\structrm\dimen252\fontdimen3\structrm\dimen253%
\fontdimen4\structrm\dimen254\fontdimen7\structrm\dimen255}}%