You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(9R,18S,27S)-9,18,27-tris[2-(4-methylphenyl)ethynyl]heptacyclo[18.7.0.02,10.03,8.011,19.012,17.021,26]heptacosa-1,3,5,7,10,12,14,16,19,21,23,25-dodecaene-9,18,27-triol is the IUPAC name of a molecule. Please give its molecular formula.
user
C54H36O3
assistant