Clavelina cylindrica has yielded two novel alkaloids in 1993, cylindricine A, the first naturally occurring pyrrolo[2, 1-j]quinoline, and cylindricine B, a pyrido-[2,1-j]-quinoline ring compound.[2] Further research the following year led to the discovery of further cylindricines C to G,[3] and a further three, H to J in 1995.[4]
^Blackman, Adrian J.; Li, Caiping; Hockless, David C. R.; Skelton, Brian W.; White, Allan H. (1993). "Cylindricines A and B, novel alkaloids from the ascidian Clavelina cylindrica". Tetrahedron. 49 (38): 8645โ8656. doi:10.1016/S0040-4020(01)96270-2.
^Li, Caiping; Blackman, Adrian J. (1994). "Cylindricines C-G, Perhydropyrrolo[2,1-j]quinolin-7-one Alkaloids From the Ascidian Clavelina cylindrica". Australian Journal of Chemistry. 47 (7): 1355โ1361. doi:10.1071/CH9941355.
^Li, Caiping; Blackman, Adrian J. (1995). "Cylindricines H-K, Novel Alkaloids From the Ascidian Clavelina cylindrica". Australian Journal of Chemistry. 48 (5): 955โ965. doi:10.1071/CH9950955.