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I would like to draw a Sydnone with chemfig. How do I get the -+ into the ring?

Sydnone

\documentclass{article}  
\usepackage{tikz}
\usepackage{chemfig}

\begin{document}  
\chemfig{N**5(-[,,1]\chembelow{N}{H}-[,,1]-[,3,1](=[,1,1]O)-[,3,]O-[,3])}
\end{document}  
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    Welcome to TeX.SX! Please help us to help you and add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}. – DG' Apr 16 '15 at 11:56
  • With the code available, people can just complete the code to have the charge. Without any code, all-purpose answer would be: Use tikz to place the charge inside the ring. Right now, it is impossible to me more specific. – Johannes_B Apr 16 '15 at 12:03
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    Related: tex.stackexchange.com/a/156500/21930 – Manuel Apr 16 '15 at 12:03
  • Also related tex.stackexchange.com/questions/229514/… – Manuel Apr 16 '15 at 12:11

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