You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(3-cyano-4-fluorophenyl)-3-(cyclopropylmethyl)-1-imino-7-methyl-2,3,4,5-tetrahydropyrrolo[3,4-f]thiazepine-6-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H22FN5OS
assistant