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 2-[[ethyl-[(4-oxo-3H-quinazolin-2-yl)methyl]amino]methyl]-6-(4-methoxyphenyl)-3H-thieno[3,2-d]pyrimidin-4-one .
user
C25H23N5O3S
assistant