You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-chloropentyl-ethyl-[2-(3,4,5-trimethoxybenzoyl)oxyethyl]azanium;2-hydroxy-2-oxoacetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H32ClNO9
assistant