You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
acetylene;(1E,3E,5Z)-1,3-difluorohepta-1,3,5-triene;2-hydroxy-N-[2-[2-[(5E,7S)-7-(methylaminomethyl)nona-1,5-dien-3-yl]phenyl]ethyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
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