2,7-(Epoxypentadeca(1,11,13)-trienimino)naphtho(2,1-b)furan-1,11(2H)-dione, 5,6,9,17,19,21-hexahydroxy-2,4,12,16,18,20,22-heptamethyl-23-methoxy-8-(((p-(1-(hydroxyphosphinyl)vinyl)phenyl)imino)methyl)-, 21-acetate, monosodium salt KD1920450 Sodium (4-(1-ethenephosphonite)phenylimino)-3-formylrifamycin SV