O
O
H
H
O
H
O
H
O
H
O
H
H
C
H
H
O
N
H
O
N
H
N
H
H
N
H
H
H
H
H
H
H
O
O
H
H
O
H
N
H
O
H
H
C
C
Br
H
C
O
H
H
H
H
H
O
O
H
O
O
H
Cl
H
H
H
H
H
O
O
O
O
F
H
O
H
H
I
H
O
N
N
O
O
H
O
H
N
H
H
H
H
O
H
O
H
O
N
H
H
O
N
H
O
O
H
O
O
H
N
H
H
H
N
H
H
O
H
H
H
H
O
H
O
O
H
O
H
O
H
Cl
N
H
H
H
H
H
O
H
H
O
H
O
O
H
N
H
H
H
H
N
H
H
H
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