\begin{overpic}[width=0.49\textwidth]{K5}
\put(1,74){\colorbox{white}{(\sublabel{K5}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20200124141146-451014}{K5}}}
%%(\subref{K5}) \href{K5}
\color{red}
\end{overpic}
<?xml version="1.0" encoding="UTF-8"?>
<acquisitions>
</acquisitions>