You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [(3aS,4R,6aS,8R,9R,9aR,9bS)-9-(chloromethyl)-8,9-dihydroxy-3,6-dimethylidene-2-oxo-3a,4,5,6a,7,8,9a,9b-octahydroazuleno[4,5-b]furan-4-yl] (2S)-3-chloro-2-hydroxy-2-methylpropanoate into molecular formula.
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C19H24Cl2O7
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