702 



VTTT. PEOVTTAMINS D AND VITAMINS D 



products which contain the three conjugated double bonds attached to a 

 cyclohexane ring. The biological efficacy of these products has not been 

 investigated. Milas-^^ has also reported the preparation of biologically ac- 

 tive alkyl ethers of vitamin D from metal vitaminates. The methyl ether 

 is reported as having a potency of 7,500,000 U.S. P. units per gram. 



jm m 2XXK xc 



Possible Simplified Synthetic Products Related to the Vitamins D 



2" N. A. Milas, U. S. Patent No. 2,410,893 (Nov. 12, 1946). 



