concentration of compound 3 (μM)	absorbance at 450 nm		
90	0.7133	0.7775	0.7257
60	0.7983	0.7929	0.7868
40	0.8233	0.8327	0.8384
20	0.8404	0.8441	0.8526
10	0.8447	0.8559	0.8389
3.33	0.8309	0.8195	0.8206
1.11	0.8282	0.8274	0.8167
positive control	0.808	0.8214	0.8449
negative control	0.1343	0.1201	0.127
