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↑Lommen, G.; De Bruyn, Marcel; Schroven, Marc; Verschueren, Wim; Janssens, Walter; Verrelst, Jan; Leysen, Josée (1995). "The discovery of a series of new non-indole 5HT1D agonists". Bioorganic & Medicinal Chemistry Letters. 5 (22): 2649–2654. doi:10.1016/0960-894X(95)00473-7.