1	A0A	(2s)-2-amino-4-(formyloxy)-4-oxobutanoic acid	1.000
2	FL6	(2s)-2-azanyl-4-methoxy-4-oxidanylidene-butanoic acid	0.909
3	AMB	L-2-amino-4-methoxy-cis-but-3-enoic acid	0.818
4	AW9	(2z)-4-methoxy-4-oxobut-2-enoic acid	0.818
5	HMB	(4s)-4-hydroxy-4-methoxybutanoic acid	0.818
6	MSU	Succinic acid monomethyl ester	0.818
7	UR9	(E)-4-methoxy-4-oxidanylidene-but-2-enoic acid	0.818
8	0AK	(2s)-2-amino-4-(2-chloroethoxy)-4-oxobutanoic acid	0.769
9	A5N	O-carboxy-4-imino-L-homoserine	0.769
10	5F0	(3~{S})-3-azanyl-4-methoxy-4-oxidanylidene-butanoic acid	0.750
11	9J3	4-ethoxy-4-oxobutanoic acid	0.750
12	BB7	(2z)-2-amino-4-methoxy-3-sulfanylbut-2-enoic acid	0.750
13	NF3	(~{z})-4-ethoxy-4-oxidanylidene-but-2-enoic acid	0.750
14	AS2	(2r)-2-amino-4-oxobutanoic acid	0.727
15	HSE	L-homoserine	0.727
16	ASB	Aspartic acid-4-carboxymethyl ester	0.714