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 ethyl 3-(4-chlorophenyl)-4-[[(2S)-2-phenylpropyl]amino]-[1,2]oxazolo[5,4-d]pyrimidine-6-carboxylate ?
user
C23H21ClN4O3
assistant