How can I create multiple connections in a molecule using the chemfig usepackage?

Question

Dear fellow Tex users,

I would like to draw some complex molecules using the chemfig package and am facing a problem when wishing to make several independent connections between atoms in my molecule. I wanted to use the ? as a connection option, but it seems, that this only works for connections sharing a central atom. How can I make more than one connections?

My example code (below) gives me the output depicted in the picture.

Code:

\documentclass[a4paper]{article}
\usepackage{chemfig}

\begin{document}
\chemfig{*7(A-B(-)(-[::5]H(-)(-[:120]K)-[::35]I-[::35]J?)-C?-D-E(-[::-20])(-[::260])-F-G-)}
\end{document} 

I would now like to also connect node K with both node I and node D. How can this be achieved? Thanks in advance for any help on this problem!

Answer 1

I found a solution for my problem and I wanted to share it with you. The chemfig package also allows you to set "anchors" by adding a name for the anchor in brackets. In my example below I set one anchor for closing the connection from C to J and another for the connection from K to I and D.

\documentclass[a4paper]{article}
\usepackage{chemfig}
\begin{document}
\chemname{%
   \chemfig{*7(A-B(-)(-[::5]H(-)(-[:120]K?[upper])-[::35]I?[upper]-[::35]J?[ring])-C?[ring]-D?[upper]-E(-[::-20])(-[::260])-F-G-)}
}%
{longicyclene}
\par 
\end{document}