You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-N,3-N,3-N-tris[3,5-bis(2,3-dihydroxypropylcarbamoyl)-2,4,6-triiodophenyl]cyclohexane-1,3,5-tricarboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C51H60I9N9O21
assistant