You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by (4R)-4-[(5R,7R,8R,9S,10S,12S,13R,14S,17R)-7,12-diformyloxy-10,13-dimethyl-3-oxo-1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-17-yl]pentanoic acid ?
user
C26H38O7
assistant