You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,3S,4S)-3-[(2S)-2-hydroxy-2-phenylethyl]selanyl-1,7,7-trimethylbicyclo[2.2.1]heptan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24O2Se
assistant