\documentclass{article} \usepackage[T1]{fontenc} \usepackage{graphicx,chemscheme} \usepackage[inactive,final]{pst-pdf} \begin{document} \floatcontentscentre An example file for PDFLaTeX use. \begin{scheme} \schemeref{IMesHCl} \schemeref{IMes} \includegraphics{scheme-two} \caption{A scheme with automated compound numbers.} \label{sc:scheme-one} \end{scheme} \end{document}