**4.1 Patellamides**

Patellamides are cyclic peptides isolated from the cyanobacterium *Lissoclinum patella*. Patellamides A, C, D exhibits cytotoxic effects. Patellamides A and C inhibit the growth of murine leukemia cells, while patellamide D acts as a resistance modifying agent in the multidrug resistant human leukemia cell lines [28].
