1 5LM 5-[(E)-3-thiophen-2-ylprop-2-enylidene]-1,3-diazinane-2,4,6-trione 1.000 2 5LL 5-[(E)-3-(furan-2-yl)prop-2-enylidene]-1,3-diazinane-2,4,6-trione 0.889 3 5TI 5-[3-(4-methoxyphenyl)prop-2-enylidene]-1,3-diazinane-2,4,6-trione 0.762