\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}            % Modern font encoding
\usepackage[runs=2]{auto-pst-pdf}   % Use EPS graphics with pdfLaTeX
\usepackage{booktabs}               % Better table layouts
\usepackage[journal=rsc]{chemstyle} % Of course!
\usepackage{geometry}               % Easy page layout
\usepackage{lmodern}                % Use Latin Modern fonts
\usepackage[version=3]{mhchem}      % Formula subscripts using \ce{}
\begin{document}
\end{document}