CAS No:80621-76-7||Chemical Formula:C43H49N3O11||Molecular Weight:783.87500||Exact Mass:783.33671||(2S,7Z,16Z,18E,20S,21S,22R,23R,24R,25S,26R,27S,28E)-5,21,23-trihydroxy-27-methoxy-2,4,11,16,20,22,24,26-octamethyl-1,6,15-trioxo-1,2,6,7-tetrahydro-2,7-(epoxypentadeca[1,11,13]trienonitrilo)[1]benzofuro[4,5-e]pyrido[1,2-a]benzimidazol-25-yl acetate (6-O,14-didehydrorifaximin)