1. L. Cariello, S. Crescenzi, G. Prota, F. Giordano andL. Mazzarella, Chem. Commun.1973, 99.
2. L. Cariello, S. Crescenzi, G. Prota, S. Capasso, F. Giordano andL. Mazzarella, Tetrahedron, in press.
3. Various colonies of animals, collected in different period of the year in the Bay of Naples, were analyzed and in all cases they were found to contain the same zoanthoxanthin pattern.
4. During the elution of the column with 1N ammonia solution, zoanthoxanthin (I) is also desorbed but, owing to its insolubility in water, it precipitates mostly on the resin as fine yellow needles.
5. Found: C, 58.95; H, 6.12; N, 34.21. C12H14N6 requires: C., 59.49; H, 5.82; N, 34.69%.