C1(S)
C2(R)
C3
C4(S)
C5(R)
C6(R)
N
H
2
N7
O
H
O8
N
H
N9
C10
O
H
O11
C12(S)
C13(S)
O
O14
C15(R)
C16(S)
C17(S)
O
O18
C19
O
H
O20
O
H
O21
O
O22
C23(R)
C24(R)
C25(S)
C26(R)
C27(R)
O
O28
O
O29
O
H
O30
O
H
O31
O
H
O32
C33(S)
C34
O
H
O35
N
H
2
N36
H
H12
H
H17