/usr/share/entity-map/0.1.0/ISOtech.2l1tr is in linuxdoc-tools 0.9.69-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/entity-map/0.1.0/ISOtech.2tr
/usr/share/entity-map/0.1.0/ISOtech.2tr