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What is the molecular formula of the molecule identified by (1'R,4S)-N,6,7-trimethyl-N-[2-[(5-methyl-1,2-oxazol-3-yl)amino]-2-oxoethyl]spiro[2,3-dihydrochromene-4,2'-cyclopropane]-1'-carboxamide ?
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C21H25N3O4
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