\begin{overpic}[width=0.49\textwidth]{IC2501}
\put(1,74){\colorbox{white}{(\sublabel{IC2501}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20090220101304879.hkitagawa}{IC2501}}}
%%(\subref{IC2501}) \href{IC2501}
\color{red}
\end{overpic}
<?xml version="1.0" encoding="UTF-8"?>
<acquisitions>
</acquisitions>