You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [(2S,5R)-2-[[(4S,6S,6aR,9S)-1-hydroxy-3,6,9-trimethyl-4-(2-methylprop-1-enyl)-5,6,6a,7,8,9-hexahydro-4H-phenalen-2-yl]oxy]-3,5-dihydroxy-6-methyloxan-4-yl] acetate into molecular formula.
user
C28H40O7
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