You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (E)-2-[(1R,2S,6S,7S,8R)-4,4-dimethyl-7-phenylmethoxy-3,5,10,11-tetraoxatricyclo[6.2.1.02,6]undecan-2-yl]but-2-ene-1,4-diol ?
user
C20H26O7
assistant