I would like to draw in chemfig
the following picture:
But I am struggling with the "+" sign in the middle of the circle. Is there a way to draw it? Thank you!
What I have so far is this:
\documentclass{article}
\usepackage{chemfig}
\begin{document}
\chemfig{
N**[0,-150,dash pattern=on 2pt off 2pt]5(
(-R)-(-R^1)-[,,1,2]{+\hspace{0.3cm}}|{O}-[,,2,1]--
)
}
\end{document}
which does the work, but I really don't like the way it is done (e.g. it does not scale).
\documentclas…
and ending with\end{document}
). – Manuel Jan 29 '14 at 10:27