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A new 1,4-dihydroquinoline compound, 2'-thioxo-2',3'-dihydro-1'H,2H-spiro [naphtho[2,1-b]furan-1,5'-pyrimido[4,5-b]quinoline]-2,4'(10'H)-dione(C22H13N3O3S), has been synthesized by the condensation of isatin, 2-thiobarbituric a