1 SPJ (3r,3'R)-N~1~,N~1~'-butane-1,4-diyldibutane-1,3-diamine 1.000 2 SPZ (3s,3'S)-N~1~,N~1~'-butane-1,4-diyldibutane-1,3-diamine 1.000 3 298 N-[(1e,2z)-but-2-en-1-ylidene]-N'-[(2e)-but-2-en-1-ylidene]butane-1,4-diamine 0.875 4 MD2 N,N'-bis(2,3-butadienyl)-1,4-butane-diamine 0.875 5 SPK Spermine (fully protonated form) 0.875 6 SPM Spermine 0.875 7 Q9C N-{4-[(3-aminopropyl)amino]butyl}acetamide 0.706