Table 1.

Effect of BA derivatives on the chymotrypsin-like activity of 20S proteasome.

Compounds	Structures		IC50# (μg/ml)
	R1	R2
DSB*1 (2)		OH	4.0
A15*1 (3)		OH	8.2
A16*1 (4)		OH	>20
A18*1 (5)		OH	>20
LH68*1 (6)		OH	6.5
LH141*2 (7)			>20
IC9564*2 (8)	H		>20

The chemical structures and characteristics of these compounds are described in reference 16 (^*1) and 22 (^*2).

^#The IC50 values in the table are the average of three experiments.