chemfig: Error when using fine adjustment of bond

Question

I'm having some problems when using fine adjustment of bond #(<dim1>,<dim2>) inside a definesubmol code. The output is correct, but return a error message:

line 7: Illegal parameter number in definition of \CF@@ring. ...t,-3.25pt)[::30,,,,line width=6pt]>[::-75]}
line 9: Illegal parameter number in definition of \CF@remain@molecule. \chemfig{!{ring}}
      : No file Molecule.aux.
      : Label(s) may have changed. Rerun to get cross-references right.

My code is:

\documentclass{article}
\usepackage{chemfig}
\begin{document}
    It's works:\par
    \chemfig{(-[::-165])-[:-15]-[::30]-[::-75](-[::75])<[::-135]-#(-1.75pt,-3.25pt)[::30,,,,line width=6pt]>[::-75]}\par
    \bigskip
    \definesubmol{ring}{(-[::-165])-[:-15]-[::30]-[::-75](-[::75])<[::-135]-#(-1.75pt,-3.25pt)[::30,,,,line width=6pt]>[::-75]}
    Is drawn but return a error:\par
    \chemfig{!{ring}}
\end{document}

Answer 1

I was able to reproduce the error with chemfig v.1.34, which is the version you are using.

With the current version v1.41 the code compiles without problem, so the solution is very simple: update your TeX distribution to get up to date with the current chemfig version