1	MSU	Succinic acid monomethyl ester	1.000
2	AW9	(2z)-4-methoxy-4-oxobut-2-enoic acid	1.000
3	HMB	(4s)-4-hydroxy-4-methoxybutanoic acid	1.000
4	UR9	(E)-4-methoxy-4-oxidanylidene-but-2-enoic acid	1.000
5	5F0	(3~{S})-3-azanyl-4-methoxy-4-oxidanylidene-butanoic acid	0.900
6	9J3	4-ethoxy-4-oxobutanoic acid	0.900
7	FL6	(2s)-2-azanyl-4-methoxy-4-oxidanylidene-butanoic acid	0.900
8	NF3	(~{z})-4-ethoxy-4-oxidanylidene-but-2-enoic acid	0.900
9	A0A	(2s)-2-amino-4-(formyloxy)-4-oxobutanoic acid	0.818
10	AMB	L-2-amino-4-methoxy-cis-but-3-enoic acid	0.800
11	OKG	4-peroxy-4-oxobutanoic acid	0.800
12	SSN	4-oxobutanoic acid	0.778
13	0AK	(2s)-2-amino-4-(2-chloroethoxy)-4-oxobutanoic acid	0.750
14	9HB	Dimethyl fumarate	0.727
15	BB7	(2z)-2-amino-4-methoxy-3-sulfanylbut-2-enoic acid	0.727
16	BKQ	Ethyl levulinate	0.727
17	EOU	Dimethyl (~{E})-but-2-enedioate	0.727
18	AS2	(2r)-2-amino-4-oxobutanoic acid	0.700
19	ASA	Aspartic aldehyde	0.700
20	ASJ	(3s)-3-amino-4-hydroxybutanoic acid	0.700
21	B3S	(3r)-3-amino-4-hydroxybutanoic acid	0.700
22	FUM	Fumaric acid	0.700
23	GVE	Methyl 4-aminobutanoate	0.700
24	HSE	L-homoserine	0.700
25	MAE	Maleic acid	0.700
26	SHF	Laevulinic acid	0.700
27	SIN	Succinic acid	0.700
28	SJ3	(4r)-4-hydroxypentanoic acid	0.700
29	VGX	4-hydroxy-2-oxobutanoic acid	0.700