4,4 -Bithiazole metal complexes

The copper complexes of all natural BLMs give the same electronic (Fig. 7) and CD (Fig. 16) spectra, which suggest that the terminal amine is not involved in the metal binding. The difference electronic absorption spectrum between copper-chelated and metal-free BLM (Fig. 14) is the same as that of PHM. It indicates that the bithiazole chromophore of BLM is neither involved in the metal binding and that BLM and PHM have the same coordination geometry. 

---