You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 2-methyl-N-[(4-thiomorpholin-4-ylphenyl)methyl]-6-(trifluoromethyl)pyridine-3-carboxamide using the IUPAC nomenclature.
user
C19H20F3N3OS
assistant