You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4R)-4-[(3R,5R,10S,13R,17R)-7-hydroxy-10,13-dimethyl-3-[4-(pyridin-2-ylmethylamino)butylamino]-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoic acid by IUPAC nomenclature, provide its molecular formula.
user
C34H55N3O3
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