Three new siderophores, termed hyalachelins A-C (1-3), were isolated from the terrestrial myxobacterium Hyalangium minutum. Their structures were determined by 2D NMR and HR-MS/MS experiments, and their stereochemical configuration was established by a combination of NMR data, quantum mechanical calculations, and circular dichroism experiments. Hyalachelins are unusual catecholate-type siderophores that bear a 3,7,8-trihydroxy-1-oxo-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid. Their iron chelating activities were evaluated in a CAS assay showing EC50 values of similar to 30 mu M
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