You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule methyl (1R,3S,4aR,4bS,6R,8aR,10aR)-3-acetyloxy-6-[(2S,3R,4S,5R)-3,4-dihydroxy-2,5-dimethoxyoxolan-3-yl]-4b,10a-dimethyl-4,8-dioxo-1,2,3,4a,5,6,7,8a,9,10-decahydrophenanthrene-1-carboxylate .
user
C26H38O11
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