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 5-[(4-chlorophenyl)methyl]-2-[(2R)-1-(1,3-dimethylpyrazol-4-yl)sulfonylpyrrolidin-2-yl]-1,3-oxazole ?
user
C19H21ClN4O3S
assistant