1	BZP	N1-carboxypiperazine	1.000
2	1FP	Piperazine-1-carbaldehyde	0.889
3	ZGX	1-(3,4-dihydropyrazin-1(2h)-yl)ethan-1-one	0.800
4	PW3	4-acetyl-piperazin-2-one	0.727
5	FPI	N-formylpiperidine	0.700