The molecule is a phenolate anion resulting from the deporotonation of the phenolic hydroxy group of rifamycin SV hemiaminal. The major species at pH 7.3. It derives from a rifamycin SV(1-). It is a conjugate base of a rifamycin SV hemiaminal.
(7S,9E,11S,12R,13S,14R,15R,16R,17S,18S,19E,21Z)-13-acetyloxy-15,17,25,27-tetrahydroxy-11-methoxy-3,7,12,14,16,18,22-heptamethyl-6,23,29-trioxo-8,30-dioxa-24-azatetracyclo[23.3.1.14,7.05,28]triaconta-1(28),2,4,9,19,21,26-heptaen-2-olate