TETRAPYRROLES 



45 



H,C 



CH2 — CH3 



CH2 COOCH3 

 COOH 



Mg vinylpheoporphyrin a5 



HX 



H,C 



CH, — CH, 



CH, 



Pheophorbide a 



Fig. 3. Magnesium vinylpheoporphyrin 05 (top) and 

 Pheophorbide a (bottom). 



