You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[4-hydroxy-6-(hydroxymethyl)-2-[[12-hydroxy-4,4,8,10,14-pentamethyl-17-[6-methyl-2-[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyhept-5-en-2-yl]-2,3,5,6,7,9,11,12,13,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl]oxy]-5-(3,4,5-trihydroxyoxan-2-yl)oxyoxan-3-yl]oxy-6-methyloxane-3,4,5-triol by IUPAC nomenclature, provide its molecular formula.
user
C53H90O21
assistant