You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tripotassium;(5E,9E)-4-hydroxy-6,10,14-trimethyl-1-phosphonopentadeca-5,9,13-triene-1-sulfonate is the IUPAC name of a molecule. Please give its molecular formula.
user
C54H96K3O21P3S3
assistant