O
O3P
P
P1P
O
H
O1P
O
H
O2P
O
O4P
C5A
C5P
C6P
N
N1P
C4P
CPP
O
H
OPP
C2P
C2A
C4A
N
H
N19
C23
C22(R)
C21(S)
O
H
O21
O
O22
C18(R)
C19(R)
N
H
2
N23
C20(R)
O
H
O20
O
O18
C15(S)
C14(R)
O
H
O14
C16(R)
C17
O
H
O17
O
O16
C13(S)
O
O11
C11(R)
C12(S)
O
H
O12
C10(R)
C9(S)
N
H
2
N9
C8
C7(R)
N
H
2
N7
O
O1
C1(R)
O
O5
C5(R)
C6
N
H
2
N6
C4(S)
O
H
O4
C3(R)
O
H
O3
C2(R)
N
H
2
N2