You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2R)-2-cyano-3-methylbutan-2-yl]-2-[methyl-[(1R)-1,2,3,4-tetrahydronaphthalen-1-yl]amino]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H27N3O
assistant