You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[(2R,3R,4S,5R,6R)-4-(2-carboxyacetyl)oxy-6-[[2-(3,4-dihydroxycyclohexyl)-5,7-dihydroxy-3,4,4a,5,6,7,8,8a-octahydro-2H-chromen-1-ium-3-yl]oxy]-3,5-dihydroxyoxan-2-yl]methoxy]-3-oxopropanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H41O17+
assistant