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 (4Z,7S,10S)-4-ethylidene-16-fluoro-7-propan-2-yl-10-[(E)-4-tritylsulfanylbut-1-enyl]-9-oxa-3,6,13,19-tetrazabicyclo[13.3.1]nonadeca-1(19),15,17-triene-2,5,8,12-tetrone .
user
C42H43FN4O5S
assistant