You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-methyl-N-[(3R,4R)-2-methyl-4-[[(2R,3R)-4-methyl-3-[(4-methylphenyl)sulfonylamino]pentan-2-yl]diselanyl]pentan-3-yl]benzenesulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H40N2O4S2Se2
assistant