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 5-[6-(3-methoxyoxetan-3-yl)-7-methyl-4-morpholin-4-ylthieno[3,2-d]pyrimidin-2-yl]pyrimidin-2-amine .
user
C19H22N6O3S
assistant