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 (6S)-N-[(2-chloro-4-fluorophenyl)methyl]-2-morpholin-4-yl-5,6,7,8-tetrahydroquinazoline-6-carboxamide .
user
C20H22ClFN4O2
assistant