5-(2-Nitrophenyl)-2-(propylsulfanyl)-5,8,9,10-tetrahydropyrimido[4,5-b]quinoline-4,6(3H,7H)-dione;pyrimido[4,5-b]quinoline-4,6(3H,7H)-dione, 5,8,9,10-tetrahydro-5-(2-nitrophenyl)-2-(propylthio)-
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