You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-[(2R)-2-[(3E,6Z)-9-cyclohexyl-9-hydroxynona-1,3,6-trien-4-yl]-4-oxoazetidin-1-yl]heptanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H39NO4
assistant