You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[2-[(2S,6S)-2,6-dimethylmorpholin-4-yl]-2-oxoethyl]-4-oxophthalazine-1-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H19N3O5
assistant