Br. Copp et al., Isolation and characterization of the new purine 1,3,7-trimethylisoguaninefrom the New Zealand ascidian Pseudodistoma cereum, J NAT PROD, 63(8), 2000, pp. 1168-1169
The new purine 1,3,7-trimethylisoguanine (1) has been isolated from the asc
idian Pseudodistoma cereum. The structure of 1 was elucidated by analysis o
f NMR spectroscopic and mass spectrometric data and by comparison with the
regioisomeric purine 1,3,7-trimethylguanine (2).