Haematopodin, an Unusual Pyrroloquinoline Derivative Isolated from the Fungus Mycena haematopus, Agaricales

First found in fungi, a pyrroloquinoline derivative, haemotopodin (1), arises in the decomposition of the native pigment of the sap. Compounds of this type, which also occur in marine sponges, can be synthesized by intramolecular cyclization of 6,7-dihydroxy-tryptamines—a potential model for their biosynthesis.