1	MME	N-methyl methionine	1.000
2	2MM	N,N-dimethyl-L-methionine	0.909
3	FME	N-formylmethionine	0.909
4	4MM	N,N,N-trimethylmethionine	0.833
5	AME	N-acetylmethionine	0.833
6	CDT	4-methylsulfanyl-2-ureido-butyric acid	0.833
7	CXM	N-carboxymethionine	0.833
8	W9J	N-carbamoyl-L-methionine	0.833
9	MDH	N-methyldehydrobutyrine	0.800
10	H9L	4-methylsulfanyl-2-oxidanyl-butanoic acid	0.727
11	KMT	4-(methylsulfanyl)-2-oxobutanoic acid	0.727
12	MED	D-methionine	0.727
13	MET	Methionine	0.727
14	MV9	(2~{R})-3-methyl-2-(methylamino)butanoic acid	0.727
15	MVA	N-methylvaline	0.727
16	NZC	N-methylidene-L-threonine	0.727
17	33X	N-methyl-D-alanine	0.700
18	DAM	N-methyl-alpha-beta-dehydroalanine	0.700
19	H00	4-sulfanylbutanoic acid	0.700
20	MAA	N-methyl-L-alanine	0.700