You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[2-methyl-3-[(3-methyl-3-pyridin-2-ylbutan-2-yl)disulfanyl]butan-2-yl]pyridine into its molecular formula.
user
C20H28N2S2
assistant