How can one define the bond length for a ring system in chemfig? **6(-[,0.5]-[,0.5]-[,0.5]-[,0.5]-[,0.5]-[,0.5])
does not work, sadly.
EDIT:
The answer provided resizes the ring system, but not the circle within it, on my system. Here's my configuration:
\documentclass[11pt]{amsart}
\usepackage[landscape, top=0.3cm, left=0.1cm, right=0.3cm, bottom=0.3cm]{geometry} % See geometry.pdf to learn the layout options. There are lots.
\geometry{letterpaper} % ... or a4paper or a5paper or ...
\usepackage{graphicx}
\usepackage{amssymb}
\usepackage{epstopdf}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[version=3]{mhchem}
\usepackage{chemfig, chemmacros}
\DeclareGraphicsRule{.tif}{png}{.png}{`convert #1 `dirname #1`/`basename #1 .tif`.png}
\begin{document}
mhchem
for your chemical formulas and also usechemmacros
load the latter with\usepackage[method=mhchem]{chemmacros}
.