You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (3E,4aS,5S)-5-hydroxy-3-[(2-hydroxy-4-methoxyphenyl)methylidene]-1,4a-dimethyl-5,6,7,8-tetrahydro-4H-naphthalen-2-one ?
user
C20H24O4
assistant