You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 5-[[4-[2-(4-methyl-1-oxophthalazin-2-yl)ethoxy]phenyl]methyl]-1,3-thiazolidine-2,4-dione ?
user
C21H19N3O4S
assistant