1	CXM	N-carboxymethionine	1.000
2	FME	N-formylmethionine	0.917
3	AME	N-acetylmethionine	0.846
4	CDT	4-methylsulfanyl-2-ureido-butyric acid	0.846
5	W9J	N-carbamoyl-L-methionine	0.846
6	MME	N-methyl methionine	0.833
7	2MM	N,N-dimethyl-L-methionine	0.769
8	U6A	N-carboxy-L-threonine	0.769
9	NXA	N-carboxyalanine	0.750
10	4MM	N,N,N-trimethylmethionine	0.714