Pyrimidine 25247-63-6 289-95-2 C00396 Pyrimidine base CHEBI:16898 P1R 1,3-Diazabenzene 1,3-Diazine EINECS 206-026-0 Metadiazine Miazine NSC 89305 m-Diazine NSC89305 AIDS-081829 131695_ALDRICH InChI=1/C4H4N2/c1-2-5-4-6-3-1/h1-4 AIDS081829 Pyrimidine, dimer ZINC00895216