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The metabolism, antitumor activity, and acute toxicity of 5-fluoro-1,3-bis-(tetrahydro-2-furanyl)-2,4-pyrimidinedione (FD-1) were investigated in animals, compared with 5-fluoro-1-(tetrahydro-2-furanyl)-2,4-pyrimidinedione (FT). It was found that after oral administration of FD-1, the level of 5-fluorouracil (5-FU) was maintained higher and longer than after administration of FT, and that a large amount of 5-FU was released from FD-1 by liver microsomal drug-metabolizing enzymes or spontaneous hydrolysis via 5-fluoro-3-(tetrahydro-2-furanyl)-2,4-pyrimidinedione (3-FT) and FT. FD-1 had a significant activity against the solid form of Ehrlich carcinoma, sarcoma-180, hepatoma AH130, Yoshida sarcoma, Walker carcinosarcoma-256, and leukemia L1210 and P388, but not the ascitic forms, and it produced greater inhibition of tumor growth than FT. The acute toxicity of FD-1 was less than that of FT.
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