You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(5S,5aS,8aR,9R)-9-(4-hydroxy-3,5-dimethoxyphenyl)-8-oxo-5a,6,8a,9-tetrahydro-5H-[2]benzofuro[5,6-f][1,3]benzodioxol-5-yl]-3-phenylurea is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H26N2O8
assistant