You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 5-[(4-fluorophenyl)methyl]-N-[(4-methylsulfonylphenyl)methyl]-4,6-dihydropyrrolo[3,4-d][1,3]thiazole-2-carboxamide .
user
C21H20FN3O3S2
assistant