You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,9S,13Z,16S)-16-acetyl-13-[(3-fluorophenyl)methylidene]-9-methyl-8-oxa-12-thia-10,15-diazatetracyclo[7.6.1.02,7.011,15]hexadeca-2,4,6,10-tetraen-14-one by IUPAC nomenclature, provide its molecular formula.
user
C22H17FN2O3S
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