Concentration of compound 1 (μM)	Absorbance at 450 nm		
90	0.2055	0.2116	0.206
60	0.2941	0.2822	0.2862
40	0.3204	0.3334	0.3218
20	0.4269	0.4555	0.4457
10	0.6755	0.6963	0.681
3.33	0.8029	0.8202	0.8352
1.11	0.7993	0.8238	0.8155
positive control	0.7864	0.8351	0.8938
negative control	0.1454	0.1437	0.1514
