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 3-[3-(9-methyl-2-methylsulfanyl-5-oxo-7,8-dihydropyrimido[4,5-e][1,4]diazepin-6-yl)phenoxy]pyrrolidine-1-carboxylic acid .
user
C20H23N5O4S
assistant