You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[2-[(19S)-19-ethyl-19-(methylsulfanylmethoxy)-14,18-dioxo-17-oxa-3,13-diazapentacyclo[11.8.0.02,11.04,9.015,20]henicosa-1(21),2,4,6,8,10,15(20)-heptaen-10-yl]ethyl]-N-propan-2-ylmethanesulfonamide into molecular formula.
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C28H33N3O6S2
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