160 



AaBC D 



OMICHOLINE. 

 Eb F G 



HH' 



Spectrum of omicholic acid. 



5. Heat a very small portion on platinum foil ; a 

 very strong urinous odour will be evolved. 



6. Examine the ethereal or chloroform solution in 

 concentrated sunlight, and notice a strong green 

 fluorescence. 



Omicholine, C 33 H 38 N0 5 (see Uromelanine). 1. The 

 alcohol solution of resins obtained as described under 

 Uromelanine must be concentrated and poured into 

 water. Dry the precipitate, extract with ether, and 

 filter. The portion insoluble in ether is Uropittine 

 (q. v.). 



2. Evaporate the ether, dissolve the residue in a 

 little hot absolute alcohol, and pour into water. Col- 

 lect the flocculent precipitate and treat with dilute 

 ammonia. Omicholic acid will dissolve, while Omicholine 

 will remain insoluble. 



AaBC D 



Spectrum of omicholine. 



