Key points are not available for this paper at this time.
Two polar lipid-soluble macrocycles 1 and 2, containing a spiro-linked tricyclic ether ring system and an unusual seven-membered spiro-linked cyclic iminium moiety, have been isolated from the digestive glands of mussels (Mytilus edulis) and scallops (Placopecten magellanicus).
Hu et al. (1995) studied this question.