N
H
2
N1
C1(S)
C2
O
O1
C3
C4
C5
C6
N
H
N2
C7
C8
C9
C10
C11
N
H
N3
C12(S)
C13
O
O2
C14
C15
O
O3
N
H
2
N4
C16
C17(S)
C18
C19
C20(R)
C21
C22
C23
C24
C25
C26
N
H
N5
N
H
N6
O
O4
O
O5
N
H
N7
C27(S)
C28
O
O6
C29(R)
O
H
O7
C30
N
H
N8
C31(S)
C32
O
O8
C33
C34
C35
C36
N
H
3
+
N9
N
H
N10
C37(S)
C38
O
O9
C39
C40
C41
N
H
N11
C42
N
H
2
N12
N
H
2
+
N13
N
H
N14
C43(S)
C44
O
O10
C45
C46
C47
C48
C49
C50
C51
O
H
O11
H
H17
H
H18