I have that edition at home, I believe. I will check it.
I now have the UBS 3 in front of me as I type and I will transliterate:
eipen ouv autois 'o Ihsous, Amhn amhn legw 'umin, ean mh phaghte thn sarka tou uiou tou anthrwpou kai pihte autou to aima, ouk ekhete dzwhn en eautois.
It's right there - John 6:53 on page 347 of UBS 3.