You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[2-(2,4-dichlorophenyl)ethyl]-4,6-dihydroxycyclohexa-2,4-diene-1-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H14Cl2O4
assistant