5-amino-2,3-dihydro-2-methyl-2-ethylfuran-3-one
5-ethyl-5-methyl-4-oxo-2-phenyl-4,5-dihydro-3-furancarbonitrile
2-(3-aminophenyl)-5-ethyl-5-methyl-4-oxo-4,5-dihydrofuran-3-carbonitrile
2-[(2-ethyl-5-iminio-2-methyl-2,5-dihydro-3-furanyl)amino]-3-phenylpropanoate
2-[(2-ethyl-5-iminio-2-methyl-2,5-dihydro-3-furanyl)amino]benzenecarboxylate