The molecule is a member of the class of rifamycins that is rifamycin itself in which the hydroxy hydrogen at position 21 has been replaced by a phosphono group. It is a member of rifamycins, a N-iminopiperazine, a N-methylpiperazine, a cyclic ketal, a hydrazone, a semisynthetic derivative and a phosphate monoester. It derives from a rifampicin. It is a conjugate acid of a 21-phosphorifampicin(2-).
[(7S,9E,11S,12R,13S,14R,15S,16S,17S,18S,19E,21Z)-2,15,27,29-tetrahydroxy-11-methoxy-3,7,12,14,16,18,22-heptamethyl-26-[(E)-(4-methylpiperazin-1-yl)iminomethyl]-6,23-dioxo-17-phosphonooxy-8,30-dioxa-24-azatetracyclo[23.3.1.14,7.05,28]triaconta-1(29),2,4,9,19,21,25,27-octaen-13-yl] acetate