You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 3-ethenyl-1-methyl-4-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]pyrrole-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H23NO4
assistant