besifovir besifovir besifovir (inn) is an investigational medication to treat hepatitis b virus (hbv) infection. it is a novel and potent acyclic nucleotide phosphonate with a similar chemical structure to adefovir and tenofovir. besifovirclinical dataroutes ofadministrationoralatc codeidentifiers iupac name cyclopropyl}oxy)methyl]phosphonic acid cas number441785-25-7 ypubchem cid5270766chemspider4435660 nunii4plg22cquuchemical and physical dataformulac10h14n5o4pmolar mass299.227 g·mol−13d model (jsmol)interactive image smiles nc1=nc=c2n=cn(cc3(ocp(o)(o)=o)cc3)c2=n1 inchi inchi=inchi=1s/c10h14n5o4p/c11-9-12-3-7-8(14-9)15(5-13-7)4-10(1-2-10)19-6-20(16,17)18/h3,5h,1-2,4,6h2,(h2,11,12,14)(h2,16,17,18) nkey:kdnsskpzbdnjdf-uhfffaoysa-n n ny (what is this?)