TETRAPYRROLES 



39 



COOH 



I 



CH, 



H3C 



^ 



COOH 



CHj 



CH2 CH, 



' C^ 



CH,— CH,- COOH HjC-^/^^ "^ ^^.^^CH, — CH,— COOH 





H.C^1. 



/ C \ 



CH, " CH2 



I 

 CH, 



COOH 



CH, 

 COOH 



Coproporphyrin HI 



h'^n H^- 



H2C. CH, 



CH, 



I 

 CH, 



CH, 



I 

 COOH 



COOH 



Coproporphyrinogen HI 



CH, 



II 



CH CH 



HX^ /^'"-^^ 



i^^V^CH = CH2 



/ 



'"^^ N «N- ^' 



II ■ 



C 

 H 



CH, 



CH, 

 :OOH COOH 



Protoporphyrin IX 



CH, 

 CH, 



cc 



Fig. 2. Coproporphyrin III (top), Coproporphyrinogen III (middle), 

 and Protoporphyrin IX (bottom). 



