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. Author manuscript; available in PMC: 2009 Mar 2.
Published in final edited form as: Cell Mol Life Sci. 2009 Mar;66(5):788–799. doi: 10.1007/s00018-008-8557-5

Figure 1. Structure of 5-FU (left) and FdUrd (right).

Figure 1

The fluorine atom at the 5 position of the pyrimidine ring distinguishes 5-FU from uracil (hydrogen at the 5 position) and thymine (methyl group at the 5 position).