Table 2.

Chemical abstract numbers (CAS) and relative toxicity of TTX analogs [58,59].

TTX Analogs	TEF	CAS Number
TTX	1.0	4368-28-9
11-oxoTTX	0.75	123665-88-3
11-deoxyTTX	0.14	-
11-norTTX-6(R)-ol	0.17	-
11-norTTX-6(S)-ol	0.19	-
4-epiTTX	0.16	98242-82-1
4,9-anhydroTTX	0.02	13072-89-4
6,11-dideoxyTTX	0.02	-
5-deoxyTTX	0.01	-
5,6,11-trideoxyTTX	0.01	-
4-CysTTX	-	-
5,11-dideoxyTTX	-	-

* TEF—toxic equivalency factor.