C2
C3
C4
C5
C6
C7
C8
C9
C11
C12
C13
N
N16
O
O78
C75
N
H
N76
O
H
O77
C54(R)
N
N55
S
S60
O
O62
C63
C68
C67
C66
C69
C74
C73
C72
C71
C70
C65
C64
O
O61
O
O56
C57
C59
C58
C51
C50
N
H
N49
C48
O
O53
C47
C46
C45
N
H
N44
C43
O
O52
C39
C38
C40
C41
C42
C37
C34
O
O35
N
H
N33
C32
C31
C30
C29
O
O36
N
H
N28
C27
C26
C20(R)
C21
O
O25
N
H
N22
O
H
O23
O
O17
C19
C24
C23
S
S1
O
O14
O
O15
C10