You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (3S,6S,9R)-17-chloro-3-methyl-6-(2-methylsulfanylethyl)-4,7-dioxo-2,5,8,14,16,18,19-heptazabicyclo[13.3.1]nonadeca-1(18),15(19),16-triene-9-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C17H27ClN8O3S
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