56 UNITY AND DIVERSITY IN BIOCHEMISTRY 



2-amino-4-hydroxy para-aminobenzoic glutamic acid 



-6-methylpterin acid 



OH 



I 

 C N 



/ \ / \ 



O H H 



N C C-CH,-N<' ^-C-N-C-CH,-CH,-COOH 



I I COOH 



H,N-C C CH 



y 



pteroic acid 



Y 



pteroylglutamic acid (folic acid) 



REFERENCES 



Bendich, a. (1955). Chemistry of purines and pyrimidines, in E. Chargaff et 



J. N. Davidson The Nucleic Acids, Vol. I, Academic Press, New York. 

 Lemberg, R. (1954). Porphyrins in nature, Fortschr. Chem. org. Naturstqffe, XI, 



299-349. 

 Sebrell, W. H. et Harris, R. S. (1954). The Vitamins, Vol. Ill, Academic Press, 



New York. 

 Wiley, R. H. (1953). Heterocyclic chemistry, in H. Oilman, Organic Chemistry: 



An Advanced Treatise, Vol. 4, Wiley, New York. 



