Table 2.

Concentration required to yield 50% inhibition of the NBT reduction (IC₅₀). Boxplots of the IC₅₀ for each group of complexes are also included.

Type	Complex	IC50 (μM)
Cu–AA	Cu–Val	30.3 [44]
	Cu–Ala	32.3 [44]
	Cu–Ile	33.1 [44]
	Cu–Gly	34.0 [44]
	Cu–Ser	37.2 [44]
Cu–dip	Cu–AlaPhe	5.0 [36]
	Cu–AlaLeu	22 [45]
	Cu–PheAla	45
	Cu–GlyVal	56
	Cu–ValGly	57
	Cu–AlaGly	124 [45]
Cu–dip–phen	Cu–AlaGly–phen	10
	Cu–PheAla–phen	2.5
	Cu–PheVal–phen	3.7
	[Cu(H2O)6]2+	30 [46]
	Cu–SOD *	0.04

* Native superoxide dismutase from bovine erythrocyte.