You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [(3S,5S,8R,9S,10S,13S,14S)-14-hydroxy-10,13-dimethyl-17-oxo-2,3,4,5,6,7,8,9,11,12,15,16-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl] acetate into molecular formula.
user
C21H32O4
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