You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (5-methyl-1,2-oxazol-4-yl)-[4-(pyridin-2-ylmethyl)-1-oxa-4,9-diazaspiro[5.5]undecan-9-yl]methanone by IUPAC nomenclature, provide its molecular formula.
user
C19H24N4O3
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