1	1FP	Piperazine-1-carbaldehyde	1.000
2	BZP	N1-carboxypiperazine	0.889
3	ZGX	1-(3,4-dihydropyrazin-1(2h)-yl)ethan-1-one	0.889
4	PW3	4-acetyl-piperazin-2-one	0.800
5	FPI	N-formylpiperidine	0.778
6	PZE	Piperazine	0.750
7	A1AKB	N,N-dimethylpiperazine-1-carboxamide	0.727
8	MJB	2-piperazin-1-ylethanol	0.700