The new purine 1,3-dimethylguanine (1) has been isolated from the ascidian Botrylloides leachi. The structure of 1 was elucidated by analysis of spectroscopic data, by comparison with the regioisomeric purine 1,3-dimethylisoguanine (2), and by hydrolysis to theophylline (3).
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Lindsay et al. (1999) studied this question.
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