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- [9] ANALYTICAL STUDIES ON PYRIMIDINE-DERIVATIVES .3. SPECTROPHOTOMETRIC DETERMINATION OF IRON (II) WITH 6-AMINO-5-NITROSO-4-OXO-1-PHENYL-2-THIOXO-1,2,3,4-TETRAHYDROPYRIMIDINE [J]. YAKUGAKU ZASSHI-JOURNAL OF THE PHARMACEUTICAL SOCIETY OF JAPAN, 1978, 98 (08): : 1077 - 1080