You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,18R,20R,24S,27S,28S)-24-tert-butyl-28-ethyl-13,13-difluoro-7-methoxy-N-[(1R,2S)-1-[(1-methylcyclopropyl)sulfonylcarbamoyl]-2-propan-2-ylcyclopropyl]-22,25-dioxo-2,21-dioxa-4,11,23,26-tetrazapentacyclo[24.2.1.03,12.05,10.018,20]nonacosa-3,5(10),6,8,11-pentaene-27-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C42H58F2N6O9S
assistant