You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4aS,8aS)-6-(2H-chromen-3-ylmethyl)-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one by IUPAC nomenclature, provide its molecular formula.
user
C17H20N2O3
assistant