You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-[2-[2-[(2S)-4-[(4-aminoquinazolin-7-yl)methyl]-2-(methoxymethyl)-3-oxopiperazin-1-yl]-2-oxoethoxy]-5-methylthiophen-3-yl]acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H31N5O6S
assistant