You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (1S,9S,12R)-9-methyl-5-[(E)-2-phenylethenyl]-12-propan-2-yl-4,8-dioxatricyclo[7.3.1.02,7]trideca-2(7),5-dien-3-one .
user
C23H26O3
assistant