You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [2-(4-ethoxycarbonyl-3,5-dimethyl-1H-pyrrol-2-yl)-2-oxoethyl]-[(4-ethylphenyl)methyl]-methylazanium .
user
C21H29N2O3+
assistant