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organic compound that is a starting material in, an intermediate in, or an end product of metabolism. Starting materials are substances, usually small and of simple structure, absorbed by the organism as food. These include the vitamins and essential amino acids.
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C4H3FN2O2 Crystals that decompose at 282-283°C; used as an antineoplastic drug and as an inhibitor of deoxyribonucleic acid synthesis. Also known as 2,4-dioxo-5-fluoropyrimidine; 5-FU.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.