You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named methyl (4R)-4-[(3S,8R,9R,10R,13S,14R,17S)-3-acetyloxy-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoate is given. What is its corresponding molecular formula?
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C27H42O4
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