*
*
*
*
*
*
*
*
*
*
*
*
*
2N5Y
ALA
GLU
GLY
PHE
SER
VAL
4N3
4FO
DSN
DTR
DAB
4FO
28J
N
H
(S)
O
N
H
(S)
O
O
-
O
N
H
O
N
H
(S)
O
N
H
(S)
O
O
H
N
H
(S)
O
N
H
O
O
(R)
N
H
O
(R)
N
H
3
+
N
H
O
(R)
O
H
N
H
O
(R)
N
H
N
H
O
(S)
N
H
3
+
N
H
O
(R)
N
H
3
+
N
H
O
(R)
(S)