You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-[[3-[(3-phenyl-1,2-oxazol-5-yl)methoxy]phenyl]methyl]-1,3-thiazolidine-4-carboxylic acid into its molecular formula.
user
C21H20N2O4S
assistant