1	OKG	4-peroxy-4-oxobutanoic acid	1.000
2	AW9	(2z)-4-methoxy-4-oxobut-2-enoic acid	0.800
3	HMB	(4s)-4-hydroxy-4-methoxybutanoic acid	0.800
4	MSU	Succinic acid monomethyl ester	0.800
5	UR9	(E)-4-methoxy-4-oxidanylidene-but-2-enoic acid	0.800
6	SSN	4-oxobutanoic acid	0.778
7	5F0	(3~{S})-3-azanyl-4-methoxy-4-oxidanylidene-butanoic acid	0.727
8	9J3	4-ethoxy-4-oxobutanoic acid	0.727
9	FL6	(2s)-2-azanyl-4-methoxy-4-oxidanylidene-butanoic acid	0.727
10	NF3	(~{z})-4-ethoxy-4-oxidanylidene-but-2-enoic acid	0.727
11	AS2	(2r)-2-amino-4-oxobutanoic acid	0.700
12	ASA	Aspartic aldehyde	0.700
13	ASJ	(3s)-3-amino-4-hydroxybutanoic acid	0.700
14	B3S	(3r)-3-amino-4-hydroxybutanoic acid	0.700
15	FUM	Fumaric acid	0.700
16	HSE	L-homoserine	0.700
17	MAE	Maleic acid	0.700
18	SHF	Laevulinic acid	0.700
19	SIN	Succinic acid	0.700
20	SJ3	(4r)-4-hydroxypentanoic acid	0.700
21	VGX	4-hydroxy-2-oxobutanoic acid	0.700