You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(2E,4E,6E,8E,10E,12E,14E,16E)-17-(4-hydroxy-2,6,6-trimethylcyclohexen-1-yl)-6,11,15-trimethylheptadeca-2,4,6,8,10,12,14,16-octaen-2-yl]-4,4,7a-trimethyl-2,5,6,7-tetrahydro-1-benzofuran-6-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C40H56O3
assistant