activity against gram-positive bacteria, but only in those organisms containing haemoproteins.

Roquefortine C contains the unusual E-dehydrohistidine moiety, a system that typically undergoes facile isomerization under acidic, basic, or photochemical conditions to isoroquefortine C, the 3,12 double-bond Z-isomer of roquefortine C. However isoroquefortine C is not a fungal product