You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5S)-N-[[(2S)-oxolan-2-yl]methyl]-7-(pyridazine-4-carbonyl)-1-oxa-2,7-diazaspiro[4.4]non-2-ene-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H21N5O4
assistant