3.4.13.23	1,10-phenanthroline	-	62	
3.4.13.23	bestatin	0.1 mM, 90% inhibition	225	
3.4.13.23	o-phenanthroline	0.1 mM, 50% inihibition	239	
3.4.13.23	p-chloromercuribenzoate	partial	43	
3.4.13.23	pyridine-2,6-dicarboxylic acid	-	7433	
3.4.13.23	Urea	completely inactive in presence of 6 M urea	116