You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (4S)-N-methyl-N-[[2-methyl-6-(4-methylpiperazin-1-yl)pyrimidin-4-yl]methyl]-3,4-dihydro-2H-pyrano[3,2-b]pyridin-4-amine .
user
C20H28N6O
assistant