You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 4-[(7,9-diamino-3-methyl-2,3-dihydrofuro[2,3-f]quinazolin-4-yl)oxy]-N,N-dimethylbenzenesulfonamide using the IUPAC nomenclature.
user
C19H21N5O4S
assistant