N
N1
C2
N
N3
C4
C5
C6
O
O2
N
H
2
N4
C1'(R)
C2D(R)
O
H
O2'
C3'(S)
C4D(R)
O
O4D
O
H
O3'
C5'
O
O5'
P
PA(S)
O
O1A
O
H
O2A
O
O3A
P
PB(S)
O
O1B
O
H
O2B
O
O3B
C10
C9'(R)
C8'
S
H
S8'
C7'
S
H
S7'
C6'
C7
O
O9'
N
N5'
C4A
N
N8'
C4B
N
N1'
C2'
N
H
2
N2'
N
N3'
C4'
O
H
O4'