Cyclopentenylcytosine (CPEC), a carbocyclic nucleoside analog of cytosine, is a potent inhibitor of CTP synthetase and causes depletion of CTP and dCTP pools. Cyclopentenylcytosine shows broad-spectrum (both DNA and RNA viruses) antiviral activity. Cyclopentenyl cytosine increases Gemcitabine (HY-17026) radiosensitisation in human pancreatic cancer cells. Cyclopentenylcytosine shows effective antiviral activity in the Ad5/NZW rabbit ocular replication model and shows anti-tumor activity in various tumor xenografts model. Cyclopentenylcytosine can be used for the study of infection and cancer[1][2][3][4].
