1	HS9	N-alpha-methyl-L-histidinamide	1.000
2	E9V	N-methyl-L-histidine	0.846
3	AVI	N,N-dimethyl-L-histidine	0.786
4	HIA	L-histidine amide	0.769
5	AVJ	N,N,N-trimethyl-histidine	0.733