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system
Provide the molecular formula for the IUPAC named substance phosphanyl (4R)-4-[(3R,5S,10S,13R,17R)-3,10,13-trimethyl-7-oxo-1,2,3,4,5,6,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-17-yl]pentanoate .
user
C25H41O3P
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