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H
O
N
R
4
O
H
R
1
N
N
+
NH
2
+
H
H
2
N
N
OH
OH
R
3
R
2
Carbamoyl
Saxitoxins
R1
R2
R3
R4
STX
HH
H
H
GTX II
H
OSO3-
H
H
GTX III
HH
OSO3-
H
NEO
OH
H
H
H
GTX I
OH
OSO3-
H
H
GTX IV
OH
H
OSO3-
H
FIGURE 14.8
The family of saxitoxin compounds.
CH
3
HO
H
3
C
H
H
CH
3
O
H
H
O
H
O
H
H
OH
H
H
H
HO
O
O
O
H
H
O
O
HO
H
H
O
O
H
H
HO
O
H
O
H
O
H
H
HH
H
3
C
CH
3
OH
FIGURE 14.9
Chemical structure of ciguatoxin (named CTX1B).
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