Compound

R₅

Ar

R

1

H

H

2

H

2-OH

3

H

3-OH

4

H

2-OCH₃

5

H

4-NO₂

6

H

H

7

H

H

8

Cl

H

9

Cl

2-OH

10

Cl

3-OH

11

NO₂

2-OH

12

2-OH

13