You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-N-(3-cyano-4-fluorophenyl)-3-(1-hydroxyethyl)-1-imino-7-methyl-1-oxo-2,3,4,5-tetrahydropyrrolo[3,4-f]thiazepine-6-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H20FN5O3S
assistant