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ethyl 1-butyl-2-[(3-fluorobenzoyl)imino]-10-methyl-5-oxo-1,5-dihydro-2H-dipyrido[1,2-a:2,3-d]pyrimidine-3-carboxylate (Z)-ethyl 1-butyl-2-((3-fluorobenzoyl)imino)-10-methyl-5-oxo-2,5-dihydro-1H-dipyrido[1,2-a:2',3'-d]pyrimidine-3-carboxylate 2H-Dipyrido[1,2-a:2',3'-d]pyrimidine-3-carboxylic acid, 1-butyl-2-[(3-fluorobenzoyl)imino]-1,5-dihydro-10-methyl-5-oxo-, ethyl ester