GO:0051575:   5"-deoxyribose-5-phosphate lyase activity
Catalysis of the beta-elimination of the 5" deoxyribose-5-phosphate at an abasic site in DNA where a DNA-(apurinic or apyrimidinic site) lyase has already cleaved the C-O-P bond 3" to the apurinic or apyrimidinic site.