You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 3-propan-2-yloxy-N-(3-pyridin-3-yl-1,3-dihydropyrrolo[1,2-c][1,3]thiazol-7-yl)benzamide into molecular formula.
user
C21H21N3O2S
assistant