Mallet — Constitutional formulm of Urea^ 



This formula (No. 2) may sei 

 Strecker's di-methjl-xanthine is 

 theobromine, C.HgN.O^, if we i 

 No. 1, and caffeine, C„H, „N,0o, 



explain the fact 

 ;ric, not identical, ^ 

 ! the latter to be a 



2. Caffeine (weak ba 



i : I 



both urea residues in each of these formulge being similarly 

 connected with the acid nucleus. The relation to di-methyl- 

 paraban (cholestrophan) is obvious. 



We may probably assume No. 1 as the formula of caffeidine, 

 C^HjgN^O (a stronger base than caffeine). 



1. Caffeidine. 2. Hypoxanthine (sarcine)— (weak base), 



n— N— CH3 



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Hypoxanthine, C^H^N^O, exhibits the s 



with xanthine, and containing one atom less oxygen may uc 



represented as in No. 2, above. 



" " s and xanthine accord 



by Strecker of the latter 



xidation, and of a mixture of both bases 



3id by reduction with sodium amalgam. 



Passing to the compounds in which two acid residues are 



united with each other and at the same time with residues of 



urea, we may formulate oxalantine, CeH^N^Oj, as follows: 



The above formulae for hypoxanth 

 well with the reported prodi: 

 from the former by oxid 



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