Selected anion inhibition constants of

Anion	TcruCA	hCA II	SspCA
Anion	K_i(mM)^a
Hg²⁺	8.40	0.85	0.77
HSO₃^-	0.97	89	21.1
SO₃^2-	7.6	7.5	2.3
HS^-	0.70	0.04	0.58

TcruCA: α-CA isolated from Thiomicrospira crunogena XL2 [15]; hCA II: α-CA from humans (isoform II); SspCA: α-CA isolated from Sulfurihydrogenibium yellowstonense YO3AOP1 [18]; ^aInhibition contstants adapted from Mahon et al. [14]

Table 1: Selected anion inhibition constants of CAs suggested as CDR-agents.