Pfizer Handbook of Microbial Metabolites 



568 



1057 Riboflavin-5'-phosphate, C17H21O9N4P, yellow microcrystals. 



HN 



,^^N^^N 



CHo 



H— C— OH 



I 

 H— C— OH 



I 

 H— C— OH 



I 

 CH2 



I 

 O 



I 

 HO— P— OH 



i 

 O 



CH3 



CH3 



Yeast 



Otto Warburg and Walter Christian, Biochem. Z. 254 438 

 (1932); 258 496 (1933); 263 228 (1933). (Isolation) 



H. S. Forrest and A. R. Todd, J. Chem. Soc, 3295 (1950). 

 ( Synthesis ) 



1058 Folic Acid (Pteroyl glutamic Acid Folacin, Vitamin B^.), C19H19- 

 OgN-, pale yellow-orange needles, which char above 250°. 



HoN 



OH 



CH2— NH- 



N Y 1' 



(/ ^C— NH— CH— CH2— CH2— COOH 

 COOH 



Yeasts and certain higher fungi 



Yields of 19-80 ^g. per gram of dry cell weight are ob- 

 tained from brewers' yeast. 



Leland A. Underkofler and Richard J. Hickey, "Industrial 

 Fermentations," Chemical Publishing Co., Inc., New York, 

 1954 Vol. Ill, J. M. Van Lanen, Production of vitamins other 

 than riboflavin. Chap. 6, pp. 191-216. (A review) 



