Table 1. Inhibitory Activity of Mercaptoacetic Acid Thioesters against MβLs^a.

	IC50 (μM)
inhibitor	NDM-1a	CcrAa	ImiSb	L1a
1	28.7		61.5	0.84
2	95.7		46.3	0.91
3	12.4	38.5	18.9	0.45
4	28.5		3.6	0.069
5		123	13.3	0.018
6			60.1	1.49
7	36.3		65.4	2.90
8				0.29
9				1.08
10				0.45

^aBlank spaces represent no inhibition. The substrate used was cefazolin (a) and imipenem (b).