You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[[5,6-bis(4-methoxyphenyl)-1,2,4-triazin-3-yl]sulfanyl]-N-(3-methoxyphenyl)butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H28N4O4S
assistant