D.A. De Biea, A. Ostrowicab, G. Geurtsena and H.C. Van Der Plasa
Novel ring transformations of pyrazines by intramolecular diels-alder reactions
Tetrahedron [TETRAB], Volume 44, Issue 10, 1988, Pages 2977-2984
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http://dx.doi.org/doi:10.1016/S0040-4020(88)90036-1