Rabacfosadine
Rabacfosadine is an acyclic nucleotide phosphonate prodrug and polymerase inhibitor that can potentially be used for its antineoplastic activity in the treatment of lymphoma in dogs. Upon administration, rabacfosadine is hydrolyzed intracellularly to 9-(2-phosphonylmethoxyethyl)-N6-cyclopropyl-2, 6-diaminopurine (cPrPMEDAP) and subsequently deaminated to 9-(2-phosphonylmethoxyethyl) guanine (PMEG) and phosphorylated to PMEG diphosphate (PMEGpp). PMEGpp binds to and inhibits DNA polymerases. This inhibits DNA synthesis, resulting in S phase arrest and induction of apoptosis.