CPC C07D 239/553 (2013.01) | 13 Claims |
1. A 5-fluorouracil raw material or active pharmaceutical ingredient, comprising 5-fluorouracil with a weight percentage of 99.9% or more and impurities with a weight percentage of 0.05% or less, and the impurities are selected from 5-methoxyuracil, and dihydropyrimidine-2,4,5(3H)-trione;
wherein the structure of the 5-methoxyuracil is
and
the structure of the dihydropyrimidine-2,4,5(3H)-trione is
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