1. Pyrimido[4,5-b][1,4]oxazines, 8-oxadihydropteridines
Danny L. Dunn, Charles G. Skinner
J. Org. Chem., 1975, 40 (25), pp 3713–3716
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http://dx.doi.org/10.1021/jo00913a020Jairo Quirogaa, Jorge Trillerasa, Braulio Insuastya, Rodrigo Aboníaa, Manuel Noguerasb, Corresponding, Antonio Marchalb, Justo Cobob
Tetrahedron Letters Volume 49, Issue 20, 12 May 2008, Pages 3257-3259
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http://dx.doi.org/10.1016/j.tetlet.2008.03.090