You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R,3S,4S,5S,6R)-6-[[12-[(2R,3S,4R,5S)-3,4-dihydroxy-6,6-dimethyl-5-(2-methylpropanoyloxy)oxan-2-yl]oxy-11-ethyl-8-hydroxy-18-(1-hydroxyethyl)-9,13,15-trimethyl-2-oxo-1-oxacyclooctadeca-3,5,9,13,15-pentaen-3-yl]methoxy]-4-hydroxy-5-methoxy-2-methyloxan-3-yl] 3,5-dichloro-2-ethyl-4,6-dihydroxybenzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C52H74Cl2O18
assistant