You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3'R,4S,6'R,7'R,8'E,11'S,12'R)-7'-[[(9aS)-8,8-difluoro-3,4,6,7,9,9a-hexahydro-1H-pyrido[1,2-a]pyrazin-2-yl]methyl]-7-chloro-7'-methoxy-11',12'-dimethyl-13'-methylidene-13'-oxospiro[2,3-dihydro-1H-naphthalene-4,22'-20-oxa-13lambda6-thia-1,14-diazatetracyclo[14.7.2.03,6.019,24]pentacosa-8,16(25),17,19(24)-tetraene]-15'-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C43H57ClF2N4O4S
assistant