Table 1.

Activity thresholds for 26,092 commercial compounds tested at 10 μM concentration against HDAC7, classified on the basis of enzyme activity percent of inhibition

Activity class	N. of compounds	% of inhibition
Inactive	23,750	< 19
Weak	2141	19–33
Moderate	144	33–50
Strong	37	50–80
Very strong	20	> 80