N3,5′-Cycloxanthosine, the first natural occurrence of a cyclonucleoside

Article abstract of DOI:10.1021/np0502692

An Eryus sp. of marine sponge from the Great Australian Bight has yielded the first reported natural occurrence of a cyclonucleoside, N ³,5'-cycloxanthosine. The structure of N³,5'- cycloxanthosine was confirmed by detailed spectroscopic analysis and total synthesis. 2005 American Chemical Society and American Society of Pharmacognosy.