Cereulide
Cereulide is a cyclic dodecadepsipeptide resembling valinomycin; it contains three repeats of four amino acids: D-Oxy-Leu—D-Ala—L-Oxy-Val—L-Val . 
<triplet> Ala <subj> amino acids <obj> instance of <triplet> Val <subj> amino acids <obj> instance of