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M. Iqbal Choudhary, Alain Meli Lannang, Shazia Anjum, Hoong-Kun Fun, David Lontsi, Jean Gustave Tangmouo. "1,13-Dimethyl-6H,7H,8H-chromeno[3′,4′:5,6]pyrano[3,2-c]chromene-6,8-dione." Acta Crystallographica Section E 62.1 (2005) o116-o118