You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4b-benzyl-7-hydroxy-10-methyl-7-(trifluoromethyl)-5,6,8,8a-tetrahydrophenanthrene-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H25F3O3
assistant