S
S51
N
N52
C53
N
H
N54
C55
C56
C57
C2
C3
C4
C5
C6
C7
S
S8
O
O9
O
O10
N
N11
C12
C13
C14
C15
C16
C17(R)
O
H
O18
C19(S)
N
H
N20
C21
O
O22
O
O23
C24(R)
C25(S)
C26(S)
C27(S)
O
O28
C29
C30(S)
C31
C41
C42
O
O43
C32
C33
C34
C35
C36
C37
C38
F
F61
F
F62
H
H26
H
H27
H
H28
H
H31