Lissoclinum patella patellins 1-6 from

L. patella from Fiji contained patellins 1-5 (50-54) [82] and earlier, solution- and solid-state conformational studies were carried out on patellin 2 (51), and the structure was determined by X-ray analysis [83]. A Lissoclinum sp. from the Great Barrier Reef yielded patellins 3 (52), 5 (54) and 6 (55) and the heptapeptide trunkamide A (56) [82]. Compounds 50-56 were all identified by interpretation of spectral data and through use of Marfey s method to determine the absolute stereochemistry of the constituent amino acids [82]. A total synthesis of the proposed structure of trunkamide A (56) revealed that the structure... 

Solution- and solid-state conformations of tawicyclamides A (57) and B (58), proline-containing cyclic peptides from a Philippines specimen of L. patella, were determined by spectroscopic and X-ray analyses respectively [87]. Patellins 1-6 (50-55), trunkamide A (56) and the tawicyclamides A-B (57-58) all lack the oxazoline ring present in most other cyclic peptides isolated from the Lissoclinum genus [22]. 

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