You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 3-hydroxy-2-[3-(3,4,5-trimethoxybenzoyl)iminoisoindol-1-yl]but-2-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H28N2O7
assistant