CH2CH3 神經毒 Anatoxin-a Homoanatoxin-a MW 165: C10H15NO MW 179; C11H17NO anabaena Re CH3 HN 3 R1N3 15 H2N o CH3 R Anatoxin-a(s MW 252: C7H17N4O4P General structure of saxitoxins Dinophytes cyanobacteria Figure 3. 2 The chemical structures of cyanobacterial neurotoxins, anatoxin-a, hamoanatoxin-a, anatoxin-a(S), and the general structure of saxitoxins. Sixteen different saxitoxins have been reported from cyanobacteria(for details see Table 3.3) MW=molecular weightAnabaena Dinophytes + Cyanobacteria 神經毒