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-[[3-(4-methylphenyl)-1,2,4-oxadiazol-5-yl]methyl]-3-[3-(2-oxopyrrolidin-1-yl)phenyl]thiourea ?
user
C21H21N5O2S
assistant