C11(S)
O
O11
C21(R)
N
H
2
N21
C31
C41(S)
O
H
O41
C51(R)
O
O51
C61
O
H
O61
C12(R)
N
H
2
N12
C62(S)
O
H
O62
C52(R)
O
O52
C42(R)
C32(S)
N
H
2
N32
C22
C13(S)
C23(R)
O
H
O23
C33(S)
C43(R)
O
O43
C53
O
H
O53
C44(S)
O
O44
C34(R)
O
H
O34
C24(R)
N
H
2
N24
C14(R)
O
O33
C54(S)
O
O54
C64
N
H
2
N64
C15(R)
C25(S)
C35(S)
C45(S)
C55(R)
C65
O
H
O25
O
H
O35
O
H
O45
O
O55
O
H
O65