Table 1.

The list of xanthone (group I and II) and benzoxanthone (group III and IV) analoques.

Compound	R1	R2	R3
Group (I)
1	N(CH2CH3)2	H	NO2
2	N(CH2CH3)2	H	H
3		H	NO2
4		H	H
25	N(CH2CH3)2	NO2	H
26		NO2	H
Group (II)
5		H	H
6		H	NO2
7	N(CH2CH3)2	H	NO2
8	N(CH3)2	H	H
Group (III)
9		H	NO2
10	N(CH2CH3)2	H	NO2
11	N(CH3)2	H	H
34		NO2	H
35	OCH2CH2OH	H	NO2
36	CH2OH	H	NO2
37	OH	H	NO2
38	CH2OCH3	H	NO2
41		H	NO2
42		H	NO2
43		H	NO2
44		H	NO2
45		H	NO2
Group (IV)
12		H	H
13	N(CH2CH3)2	H	NO2
14		H	NO2
15		H	H
16	N(CH2CH3)2	H	NO2