Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Toxins B1 and B2 from cultured dinoflagellates of the genus Protogonyaulax are shown to be the carbamoyl-N-sulfo derivatives of saxitoxin and neosaxitoxin, the structures confirmed by synthesis from the corresponding decarbamoyl toxins. ... Contribution number 486 from the ...