fgi-103 fgi-103 fgi-103 is an antiviral drug developed as a potential treatment for the filoviruses ebola virus and marburg virus. in tests on mice fgi-103 was effective against both ebola and marburg viruses when administered up to 48 hours after infection. the mechanism of action of fgi-103 has however not yet been established, as it was found not to be acting by any of the known mechanisms used by similar antiviral drugs. fgi-103legal statuslegal status us: investigational new drug identifiers iupac name 2--3h-benzimidazole-5-carboximidamide cas number907169-69-1 ypubchem cid5477931chemspider4585571uniib14v493d7bchemical and physical dataformulac19h16n6omolar mass344.369 g·mol−13d model (jsmol)interactive image smiles n=c(n)c4ccc3oc(c=cc2nc1cc(c(=n)n)ccc12)cc3c4 inchi inchi=1s/c19h16n6o/c20-18(21)10-2-5-16-12(7-10)8-13(26-16)3-6-17-24-14-4-1-11(19(22)23)9-15(14)25-17/h1-9h,(h3,20,21)(h3,22,23)(h,24,25)/b6-3+key:ookwwpfcccmwis-zzxkwvifsa-n