(Piperazin-1,4-diyl)bis[(furan-2-yl)methanone]; 1,4-Bis(furan-2-ylcarbonyl)piperazine; [4-(Furan-2-carbonyl)-piperazin-1-yl]-furan-2-yl-methanone; 1,1'-(1,4-Piperazinediyl)bis[1-(2-furanyl)methanone];