You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[(3S,8S,9S,10R,11S,12S,13S,14R,17S)-3-[(2R,4S,5R,6R)-5-[(2S,4S,5R,6R)-5-[(2S,4R,5R,6R)-5-[(2S,3R,4R,5R,6R)-3,5-dihydroxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-8,11,12,14-tetrahydroxy-10,13-dimethyl-2,3,4,7,9,11,12,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-17-yl]ethanone .
user
C49H80O19
assistant