You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aS,8aR)-6-(4,5,6,7-tetrahydro-1H-indazole-3-carbonyl)-4,4a,5,7,8,8a-hexahydropyrido[4,3-b][1,4]oxazin-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H20N4O3
assistant