N
H
2
N1
C1(R)
C2(S)
C3
O
H
O1
C4
O
O2
N
H
N2
C5(R)
C6
O
O3
C7
C8
O
O4
N
H
2
N3
N
H
N4
C9(R)
C10
C11
C12
N
H
N5
C13
C14
C15
C16
C17
C18
C19
O
O5
N
H
N6
C20(R)
C21
O
O6
C22
C23
C24
C25
C26
C27
C28
O
H
O7
N
H
N7
C29(R)
C30
C31
O
O8
N
H
N8
C32(R)
C33
O
O9
C34
C35
O
O10
N
H
2
N9
N
H
N10
C36(R)
C37
C38
C39
C40
C41
O
O11
N
H
N11
C42(R)
C43
O
O12
C44
C45
C46
O
O13
O
H
O14
N
H
N12
C47(R)
C48
O
O15
C49
C50
C51
C52
N
H
2
N13
N
H
N14
C53(R)
C54
C55
C56
C57
C58
O
O16
N
H
N15
C59(R)
C60
C61
C62
C63
C64
O
O17
N
H
N16
C65(R)
C66
C67
C68
N
H
N17
C69
N
H
2
N18
N
H
2
+
N19
C70
O
O18
O
H
O19