the surprising similarity in properties between the radicals of free base and zinc bacteriochlorins is maintained in the chlorophylls : cation radicals of bacteriopheophytin and methyl pheophorbide ( the free bases of bacteriochlorophyll and methyl chlorophyllide , respectively ) exhibit electron spin resonance properties similar to those of their magnesium-containing derivatives .
C0008260
chlorophylls
C0004638
bacteriochlorophyll