You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (8R,9S,10R,13S,14S,17R)-13-but-3-enyl-10-methyl-2,3,6,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-ol by IUPAC nomenclature, provide its molecular formula.
user
C22H34O
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