I need to draw the chemical structure of NAD+ (Nicotinamide adenine dinucleotide), My script:
\documentclass[article]{revtex4}
\usepackage{chemfig}
\begin{document}
\chemfig{*6((-H)-((\chemabove{N}{\scriptstyle\oplus}-R))=(-H)-(-(=[:90]O)-[::-60](NH_2))=(-H)-(-H)=)}
\end{document}
The result is quite ugly, the parts on the red circle: atoms are too close to the bonds lines
Help, please!