You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[[(1R,2S,3R,4R)-4-hydroxy-2-phenyl-6-[[3-(trifluoromethyl)-1,2,4-oxadiazol-5-yl]methyl]-6-azaspiro[2.4]heptan-1-yl]methyl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C19H21F3N4O3
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