You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aR,9aS)-6-[[5-methyl-4-(methylamino)pyrimidin-2-yl]amino]-4,4a,9,9a-tetrahydroindeno[2,1-b][1,4]oxazin-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H19N5O2
assistant