You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)-2-(2-methyl-6,7-dihydro-5H-pyrazolo[1,5-a]pyrimidin-4-yl)ethanone by IUPAC nomenclature, provide its molecular formula.
user
C16H24N4O3
assistant