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Four minor polar nitrogen compounds have been isolated from the New Caledonian marine sponge, Cymbastela cantharella . Three are the known products allantoin, homarine, and trigonelline and the fourth is novel. The structure of the new compound, pyraxinine ( 1 ), was shown to be 3-pyridylguanidine by spectroscopic analysis and synthesis.
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Al‐Mourabit et al. (1997) studied this question.
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