You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (1S,5R,6S)-1-(fluoromethyl)-5-[2-fluoro-5-[(2-prop-2-ynoxypyrido[3,4-b]pyrazin-5-yl)amino]phenyl]-5-methyl-2-thia-4-azabicyclo[4.1.0]hept-3-en-3-amine by IUPAC nomenclature, provide its molecular formula.
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C23H20F2N6OS
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