Catchfile 和复杂的 chemfig 符号

Question

chemfig提出了一个很好的建议，即从公共库中调用存储在各个文件中的符号这里。我已经用多种相对简单的化合物/化学符号测试了该解决方案。 这个问题显示了所提出的解决方案产生错误的情况。

怀疑该问题出在文件写入和 cat 代码处理中的某个地方。

非常感谢任何关于使代码能够处理更复杂化合物的调整建议。

我在这里包含了 mwe：

\documentclass[english,border=1mm]{standalone}
\usepackage[T1]{fontenc}
\usepackage{chemfig}
\usepackage{tikz}
\usepackage{catchfile}
\usepackage{mol2chemfig}%


\tikzset{
  % #1 = left, #2 = lower, #3 = right, #4 = upper
  enlarge bounding box by/.style n args={4}{
    execute at end picture={
      \path ([shift={(-#1, -#2)}]current bounding box.south west) --
            ([shift={(#3, #4)}]current bounding box.north east);
    }
  }
}

% chemfigdo
\newcommand{\chemfigdo}[2]{\chemfig[#2]{#1}}%

% chemfiginput
\newcommand{\chemfiginput}[2][]{%
  \CatchFileDef{\chemfiginputtemp}{#2}{\csname CF_sanitizecatcode\endcsname}%
  \expandafter\chemfigdo\expandafter{\chemfiginputtemp}{#1}%
}%

% create new command for tikzpicture call
\newcommand\callchemfigsymbol[1]{%
  \chemfiginput[
      atom style={scale=\chemfigscale},
      atom sep=\chemfigatomsep,
      chemfig style={
        enlarge bounding box by={\chemfigborder}{\chemfigborder}{\chemfigborder}{\chemfigborder},
        baseline=(current bounding box.center),
        color=\chemfigcolor,
        line width=\chemfiglinewidth
      }
    ]{#1}%
}


\begin{filecontents}{s_adenosyl_l_methionine.tex}
                   O% 6
           =[:95.9]% 26
                      (
               -[:35.9]O% 5
         -[:335.9,0.62]H% 50
                      )
          -[:155.9]% 24
                      (
              <:[:95.9]N% 10
                          (
             -[:155.9,0.62]H% 46
                          )
          -[:35.9,0.62]H% 45
                      )
                      (
         -[:155.9,0.62]H% 44
                      )
          -[:215.9]% 21
                      (
         -[:235.9,0.62]H% 39
                      )
                      (
         -[:315.9,0.62]H% 40
                      )
          -[:155.9]% 18
                      (
          -[:55.9,0.62]H% 34
                      )
                      (
         -[:135.9,0.62]H% 35
                      )
          -[:215.9]\mcfabove{S}{_{\mcfplus}}% 1
                      (
              -[:275.9]% 22
                          (
             -[:275.9,0.62]H% 42
                          )
                          (
               -[:5.9,0.62]H% 43
                          )
         -[:185.9,0.62]H% 41
                      )
          -[:155.9]% 17
                      (
          -[:55.9,0.62]H% 32
                      )
                      (
         -[:135.9,0.62]H% 33
                      )
          >[:215.9]% 13
                      (
         -[:332.9,0.62]H% 28
                      )
          -[:269.9]O% 2
          -[:197.9]% 16
                      (
              -[:125.9]% 15
                          (
                   -[:53.9]% 14
                              (
                      -[:341.9]% -> 13
                              )
                              (
                  -[:44.9,0.62]H% 29
                              )
                 <:[:107.9]O% 3
              -[:47.9,0.62]H% 36
                          )
                          (
             -[:116.9,0.62]H% 30
                          )
             <:[:179.9]O% 4
         -[:119.9,0.62]H% 37
                      )
                      (
         -[:314.9,0.62]H% 31
                      )
          <[:251.9]N% 7
    -[:197.8,0.994]% 19
           =^[:150]N% 9
            -[:210]% 27
                      (
           -[:150,0.62]H% 47
                      )
           =^[:270]N% 11
            -[:330]% 25
                      (
                -[:270]N% 12
                          (
               -[:330,0.62]H% 49
                          )
           -[:210,0.62]H% 48
                      )
            =^[:30]% 23
                      (
                 -[:90]% -> 19
                      )
    -[:342.2,0.994]N% 8
      =^[:54,0.994]% 20
                      (
          -[:126,0.994]\phantom{N}% -> 7
                      )
           -[,0.62]H% 38
\end{filecontents}


\begin{filecontents}{methane_pseudo_3D_stereo.tex}
           H% 2
     -[:270]C% 1
              (
        -[:200]H% 4
              )
              (
         <[:310]H% 5
              )
    <:[:350]H% 3
\end{filecontents}


% define the atom sep
\newlength{\chemfigatomsep}%
\setlength{\chemfigatomsep}{2.75em}%

% define the line width
\newlength{\chemfiglinewidth}%
\setlength{\chemfiglinewidth}{0.75pt}%

% define the scale
\def\chemfigscale{1}

% define the color
\def\chemfigcolor{blue!40!black}

% define separation length
\newlength{\chemfigborder}
\setlength{\chemfigborder}{1mm}



\begin{document}

%\callchemfigsymbol{s_adenosyl_l_methionine.tex}% when I uncomment this, I observe error
\callchemfigsymbol{methane_pseudo_3D_stereo.tex}% this works fine

\end{document}