You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (6R)-1-amino-3-oxo-6-[(3R,5S,7R,8R,9S,10S,12S,13R,14S,17R)-3,7,12-trihydroxy-10,13-dimethyl-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl]heptane-2-sulfonic acid by IUPAC nomenclature, provide its molecular formula.
user
C26H45NO7S
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