You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-[[(3aR,5aR,5bR,7aR,9S,11aR,13aS)-3a-[(1S)-1-(3-carboxy-3-methylbutanoyl)oxy-2-[(4-chlorophenyl)methyl-[2-(dimethylamino)ethyl]amino]ethyl]-5a,5b,8,8,11a-pentamethyl-2-oxo-1-propan-2-yl-4,5,6,7,7a,9,10,11,11b,12,13,13a-dodecahydro-3H-cyclopenta[a]chrysen-9-yl]oxy]-2,2-dimethyl-4-oxobutanoic acid by IUPAC nomenclature, provide its molecular formula.
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C54H81ClN2O9
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