You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (8R,9R,10R,11R,13S,14R,17S)-6-chloro-11,17-dihydroxy-17-(2-hydroxyacetyl)-10,13-dimethyl-9,11,12,14,15,16-hexahydro-8H-cyclopenta[a]phenanthren-3-one into its molecular formula.
user
C21H25ClO5
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