C1
C6
C7
N
H
N8
C9
N
H
N11
N
H
2
N10
C5
C4
C3
C12
O
O13
C2
C18
C23
C22
C21
C20
C19
N
H
N14
C15(R)
C16
C17
O
O24
N
N25
C28(S)
C29
O
O30
C27
C26
N
H
N31
C32(R)
C41
O
O42
C33
C34
C39
C35
C38
C36
C37
O
H
O40
N
H
N43
C44(S)
C48
C50
C49
C51
N
H
N52
C53
N
H
N55
N
H
2
N54
C45
O
O46
N
H
2
N47