You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (6-carboxy-4,5-dihydroxy-3-oxooxan-2-yl)-dimethyl-[[5-[2-[[1-(methylamino)-2-nitroethenyl]amino]ethylsulfanylmethyl]furan-2-yl]methyl]azanium by IUPAC nomenclature, provide its molecular formula.
user
C19H29N4O9S+
assistant