Compound

R1

R2

R3

R4

1

H

H

H

H

2

H

OCH3

OCH3

OCH3

3

H

H

N(CH3)2

H

4

H

H

Cl

H

5

H

OCH3

OCH3

H

6

H

H

OCH3

H

7

H

H

F

H

8

Br

H

CH2CH(CH3)2

H

9

Br

H

OCH3

H

10

H

H

CH2CH(CH3)2

H