1	NEP	N1-phosphonohistidine	1.000
2	PSH	1-thiophosphono-L-histidine	0.875
3	DHI	D-histidine	0.733
4	HHI	(2z)-3-(1h-imidazol-5-yl)-2-iminopropanoic acid	0.733
5	HIS	Histidine	0.733