You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 5-[(3E,6Z)-7-amino-3-methylhepta-3,6-dien-1-ynyl]-5-[(6-methoxy-4-oxoquinazolin-3-yl)methyl]imidazolidine-2,4-dione ?
user
C21H21N5O4
assistant