You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[(3,5,7,9,11,13,15-heptacyclopentyl-2,4,6,8,10,12,14,16,17,18,19,20-dodecaoxa-1,3,5,7,9,11,13,15-octasilapentacyclo[9.5.1.13,9.15,15.17,13]icosan-1-yl)oxy-dimethylsilyl]-2-methylidenehexanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C44H80O15Si9
assistant