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 1-[2-(4-methyl-5,6,7,8-tetrahydroquinazolin-2-yl)ethyl]-3-(2-oxo-1,3-dihydroindol-5-yl)urea ?
user
C20H23N5O2
assistant