You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R,3R,4S,5S,6R)-2-[[(1S,3R,6S,8R,9S,11S,12S,14S,15R,16R)-6,14-dihydroxy-7,7,12,16-tetramethyl-15-[(2R,5S)-2-methyl-5-[2-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxypropan-2-yl]oxolan-2-yl]-9-pentacyclo[9.7.0.01,3.03,8.012,16]octadecanyl]oxy]-6-(hydroxymethyl)oxane-3,4,5-triol by IUPAC nomenclature, provide its molecular formula.
user
C42H70O15
assistant