Saxitoxin and Related Compounds

Saxitoxin and its naturally occurring relatives

Saxitoxin Markush (guanidino form)

**Carbamoyl Saxitoxins**
Name	Registry Number	R₁	R₂	R₃	R₄
Saxitoxin	35523-89-8	H	H	H	OCONH₂
Gonyautoxin II	60508-89-6	H	OSO₃^-	H	"
Gonyautoxin III	60537-65-7	H	H	OSO₃^-	"
Neosaxitoxin	64296-20-4	OH	H	H	"
Gonyautoxin I	60748-39-2	OH	OSO₃^-	H	"
Gonyautoxin IV	64296-26-0	OH	H	OSO₃^-	"

**Decarbamoyl Saxitoxins**
Name	Registry Number	R₁	R₂	R₃	R₄
Decarbamoyl saxitoxin	58911-04-9	H	H	H	OH
Decarbamoyl gonyautoxin II	86996-87-4	H	OSO3-	H	"
Decarbamoyl gonyautoxin III	87038-53-7	H	H	OSO3-	"
Decarbamoyl neosaxitoxin	68683-58-9	OH	H	H	"

**Sulfamate Saxitoxins**
Derivative Designation	Registry Number	R₁	R₂	R₃	R₄
B1	64296-25-9	H	H	H	OCONHOSO₃^-
C1	80173-30-4	H	OSO₃^-	H	"
C2	80226-62-6	H	H	OSO₃^-	"
B2	82810-44-4	OH	H	H	"
Gonyautoxin C3	89614-45-9	OH	OSO₃^-	H	"
Gonyautoxin C4	89674-98-6	OH	H	OSO₃^-	"

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