2-cyano-1-((S)-3-methyl-5-((1S,2R,3R)-1,2,3,4-tetrahydroxybutyl)oxazolidin-2-ylidene)guanidine

N-(4-(methylthio)-6-oxo-5-phenyl-5,6-dihydro-1,3,5-triazin-2(1H)-ylidene)cyanamide

1-(amino(imidazolidin-2-ylideneamino)methylene)urea

1-(amino((tetrahydropyrimidin-2(1H)-ylidene)amino)methylene)urea

1-(amino(benzo[d]thiazol-2(3H)-ylideneamino)methylene)urea