You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5,10,15,20-tetrakis[4,6-bis(3-methylbut-2-enylsulfanyl)pyrimidin-5-yl]-21,23-dihydroporphyrin is the IUPAC name of a molecule. Please give its molecular formula.
user
C76H86N12S8
assistant