1	NBT	(2s)-2-nitrobutane	1.000
2	N1P	1-nitropropane	0.857
3	NIS	2-nitropropane	0.857
4	NIE	Nitroethane	0.714
5	PXO	(1z)-propanal oxime	0.714
6	XEM	1-nitrosopropane	0.714
7	XEP	2-nitrosopropane	0.714