You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-cyclopentyl-2-(3-methoxyphenyl)-4-propan-2-yl-5,6-dihydropyrrolo[3,2-d][1,3]thiazole-5-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H27N3O2S
assistant