You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,2,3,4,5-pentadeuterio-6-[2,3-dideuterio-1,4,4-tris(2,3,4,5,6-pentadeuteriophenyl)buta-1,3-dienyl]benzene is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H22
assistant