2,7-(Epoxy(1,11,13)pentadecatrienoimino)furo(2'',3'':7',8')naphth(1',2':4,5)imidazo(1,2-a)pyridine-1,15(2H)-dione, 25-(acetyloxy)-5,6,21,23-tetrahydroxy-27-methoxy-2,4,11,16,20,22,24,26-octamethyl-, ( 2S,16Z,18E,20S,21S,22R,23R,24R,25S,26R,27S,28E)-
Rifaximin (substance)