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 (1R,2S)-1-[2-[(1R,18R,20R,24S,27S,28S)-24-tert-butyl-28-ethyl-13,13-difluoro-7-methoxy-22,25-dioxo-2,21-dioxa-4,11,26-triazapentacyclo[24.2.1.03,12.05,10.018,20]nonacosa-3,5(10),6,8,11-pentaen-27-yl]-2-oxoethyl]-2-(2,2-difluoroethyl)-N-(1-methylcyclopropyl)sulfonylcyclopropane-1-carboxamide .
user
C43H56F4N4O9S
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