1	PZI	2-(2-oxopyrrolidin-1-yl)acetamide	1.000
2	V7J	2-(2,5-dioxopyrrolidin-1-yl)acetamide	0.909
3	UKX	(2s)-2-(2-oxidanylidenepyrrolidin-1-yl)butanamide	0.833
4	NEN	1-ethyl-pyrrolidine-2,5-dione	0.727
5	NEQ	N-ethylmaleimide	0.727
6	MB3	1-methylpyrrolidin-2-one	0.700