methyl (E)-5-(2-furyl)-2-(4-tolylsulfonylamino)pent-4-enoate

methyl (E)-5-(2-furyl)-2-aminopent-4-enoate

methyl (E)-2-(N-benzhydrylideneamino)-5-(2-furyl)pent-4-enoate

2-azido-5-furan-2-yl-penta-2,4-dienoic acid methyl ester