Three new bromotyrosine alkaloids, pseudoceratinines A ( 1 ), B ( 2 ), and C ( 3 ), have been isolated from two specimens of the sponge Pseudoceratina verrucosa . In addition, the known alkaloids aplysamine-1 ( 4 ), aplysamine-2 ( 5 ), purealin ( 6 ), and purealidins A ( 7 ) and B ( 8 ) were found in both specimens. The structures and absolute configurations of the new products were elucidated by spectral methods.
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Benharref et al. (1996) studied this question.
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