LaTeX.org

Oh! Now, I see. Stupid me! Thanks a lot!

Thanks for the advice! Unfortunately it gives me twice the number now, the first without spacing, the second with spacing.

Minimum working example:
\documentclass[journal=jacsat,manuscript=article,demo]{achemso}
\title
{Title}
\begin{document}
\renewcommand{\figurename}{Figure~S}
\renewcommand{\theequation}{S\arabic{equation}}
\begin{figure}
\centering
\includegraphics{FigureS1.png}
\caption{Figure caption}
\label ...

Heyho!

I'd be very happy if someone of you could help me with two little problems:
I need to change the naming of figures from "Figure x" to "Figure Sx".
What I have done so far is to use \renewcommand:
\renewcommand{\figurename}{Figure~S}
This gives "Figure S x". How can I get rid of the spacing ...