I am attaching your generated code and also my original code .pdf's for you to compare. The graphics doesn't show up when I run xelatex on both codes.<br><br>my code:<br>\documentclass{article}
<p style="margin:0px;text-indent:0px">\usepackage{pstricks}</p>
<p style="margin:0px;text-indent:0px">\pagestyle{empty}</p>
<p style="margin:0px;text-indent:0px">\begin{document}</p>
<p style="margin:0px;text-indent:0px">\psgrid[gridwidth=1pt,subgridwidth=0.1pt,subgriddiv=4](-3,-3)(3,3)</p>
<p style="margin:0px;text-indent:0px">\rput[b]{0}(3,2){C}</p>
<p style="margin:0px;text-indent:0px">\multirput{0}(0,0)(0.25,0.25){5}{x}</p>
<p style="margin:0px;text-indent:0px">\uput{2pt}[0]{0}(3,2){oxygen}</p>
<p style="margin:0px;text-indent:0px">\uput{4pt}[dr]{0}(1,1){oxygen}</p>
<p style="margin:0px;text-indent:0px">\end{document}</p><br>