Axinella cannabina sesquiterpenoid from

Isocyanide-containing natural products are rare they have been reported only from cyanobacteria, Penicillium fungi, marine sponges, and nudibranchs. Sesquiterpenoid and diterpenoid isocyanides are found in a limited species of sponges and nudibranchs that prey on these sponges. Axisonitrile-1 (106) isolated from Axinella cannabina is the first isocyanide-containing marine natural product. ... 

Fig. (2) Sesquiterpenoids isolated from the sponge Axinella cannabina...

Sesquiterpenoids Based on the epi-Maaliane Skeleton from the Marine Sponge Axinella cannabina. J. Nat. Prod. 48, 64 (1985). 

Cafieri, F., Fattomsso, E., Magno, S., Santacroce, C., and Sica, D. (1973) Isolation and stmcture of axisonitrile and axisothiocyanate two unusual sesquiterpenoids from the marine sponge Axinella cannabina. Tetrahedron, 29, 4259-4262. 

Cafieri, F., E. Fattorusso, S. Magno, C. Santacroce, and D. Sica Isolation and Structure of Axisonitrile-1 and Axisothiocyanate-1, two unusual Sesquiterpenoids from the marine sponge Axinella cannabina. Tetrahedron 29, 4259 (1973). 

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