Open terminal and go to folder where your cdr file are located.
hdituil convert YOUR-CDR-FILE.cdr -format UDTO -o OUTPUT-FILE-NAME.iso
<dt id="note_758" class="calibre23">[<a title="758" href="../META-INF/page.xhtml" class="calibre24">←758</a>]</dt>
<dt id="note_758" class="calibre23">[<a title="758" href="../META-INF/page.xhtml#758" class="calibre24">←758</a>]</dt>
title=\"(\d+)\" href=\"..\/META-INF\/titlepage.xhtml\"
title="\1" href="../META-INF/titlepage.xhtml#\1"
sudo: cannot get working directory cd ~/