You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (10S,13S,14R,16S,17R)-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-2,3,4,7,11,12,14,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-16-ol by IUPAC nomenclature, provide its molecular formula.
user
C27H44O
assistant