LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Pyrimidine. Molecular model of the aromatic organic compound pyrimidine (C4.H4.N2). The nitrogen atoms are at positions 1 and 3 in the aromatic ring, hence the systematic names of 1,3-diazine or meta-diazine. The three nucleobases cytosine, thymine and uracil are pyrimidine derivatives. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white) and nitrogen (blue). Illustration.
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