CONSTITUENTS OF THE BIOSPHERE 



45 



HOOC - H,C - H,C H CHj - CH^ - COOH 

 H,C<^ r if ^CH, 



HOOC - H,C - H,C 



CHj - CHj, - COOH 



HOOC - H,C - H,C 



HOOC - H„C - H,C 



HOOC - H,C - H,C 



H CHj - CH, - COOH 



^ CHj - CH, - COOH 



CH, 



H 



CHj- CHj -COOH 



CH 



CH, 



H ^"3 



Coproporphyrin I is found in yeast, and coproporphyrins I and III have 

 been isolated from faecal matter, from which they take their name. 



CHj 



HC 11 ^u. H H CH, 



CH, 



CH=CH, 



CH, 



CHj CH, 



I I 



COOH COOH 



Protoporphyrin 



CH, 



I 



COOH 



Deuteroporphyrin III 



