Table 3. General Physicochemical and Structural Anchors (Rules) to Predict Urease Inhibition Activity^a.

rule #	rule	Nactives	Ninactives	N	Pre (%)	activity class
1	fr_NH1 = 0; fr_Ar_OH > 0	15	240	255	94.1	inactives
2	fr_NH1 = 0; fr_N_O > 0	26	122	148	82.4	inactives
3	fr_NH1 = 0; fr_NH0 = 0	6	138	144	95.8	inactives
4	fr_NH1 = 0; fr_Ar_N = 0	5	55	60	91.7	inactives
5	fr_aryl_methyl > 0; fr_hdrzine > 0	59	0	59	100.0	actives
6	fr_aryl_methyl > 0; fr_sulfonamd > 0	40	2	42	95.2	actives
7	fr_aryl_methyl > 0; fr_SH > 0	32	6	38	84.2	actives
8	NumAromaticRings ≤ 3; fr_Ar_OH > 0	1	31	32	96.9	inactives
9	fr_NH1 = 0; fr_Al_OH > 0	1	29	30	96.7	inactives
10	fr_NH1 ≤ 1; fr_Al_OH > 0	6	19	25	76.0	inactives

^aN_actives and N_inactives reported refer to the compounds that are associated with a particular IF-THEN rule that defines each anchor.