You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-[7-(1-cyclopropylpiperidin-4-yl)-4-morpholin-4-yl-6,8-dihydro-5H-pyrido[3,4-d]pyrimidin-2-yl]phenyl]-3-ethylurea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H39N7O2
assistant