You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [(2R,3S,4R,4aS,10bR)-3,4-diacetyloxy-8,10-dimethyl-5-(2-nitrophenyl)sulfonyl-2,3,4,4a,6,10b-hexahydropyrano[3,2-c]isoquinolin-2-yl]methyl acetate into molecular formula.
user
C27H30N2O11S
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