You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (8R,9S,13S,14S)-3-[(3S)-3-(6-aminopurin-9-yl)-4-hydroxybutoxy]-13-methyl-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-17-one into its molecular formula.
user
C27H33N5O3
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