Cycloids containing nitrogen. 931 



1930 



CYCLOID C;H,0.N4 



Theophyllin 



T-DlAZiiRENZENESULrUONATE, CisHijOgXeS 



Burian, R. Berliu, Ber. D. chem. 

 Ges., 37, 190i, ((;96-707). 



CYCLOID C5H4ON4S 



6-Oxy-2-thiopurine. 



(Thiohypoxanthine). 



Traube, W. liiebigs Aua. 

 Leipzig, 331, 1904, (64-88). 



cliem., 



CYCLOID C8H10O2N4 



Dimethyldihydropyridazine dicarb- 



oxylic acid. Cycloliydrazide 



NH.CxMe : C.CU.NH 



NH.CMe : C.CO.XII 



and its tetrahenzoijl derivative. 



Billow, Carl. Berliu, Ber. D. chem. 

 Ges., 37, 1904, (91-95). 



CYCLOID CSH10O4N4 



a, a-Dimethylisoallituric acid 



and the ^-nhro dcrivafirc. 



Siemonsen, L. Liebigs Ann. Chem., 

 Leipzig, 333, 1904, (101-141). 



CYCLOID CnH ON4 



2-Phenylhypoxanthine. 



Traube, W. und Herrmann, L. Berlin, 

 Ber. 1). chem. Ges., 37, rj04, (2207- 

 2272). 



CYCLOID Ci Hi.OiN; 



Dimethylureideindoaniline 



^'^<\h:CO>^ '■ C6H4.NMe2 



Piloty, 0. und Finckli, K. Liebigs 

 Ann. Chem., Leipzig, 333, 1904, (22-71). 



CYCLOID C,4Hi,0_N4 



Tetramethylureideindoaniline. 



Piloty, (). und Fmckh, K. Liebigs 

 Ann. Chem., Leipzig, 333, lUOl, (22-7J). 



CYCLOIDS CONTAINING FOUR 

 NITROGEN ATOMS AND SUU'IIUR. 



CYCLOID C.H,N4S 



2-Thiopurine 



G-AMINO derivative {Tliioadenhie). 



Traube, W. Liebigs Ann. Chem., 

 Leipzig, 331, 1904, (f)4-88). 

 (:)-9724) 



CYCLOIDS CONTAINING FIVE 

 NITROGEN ATOMS AND 

 OXYGEN. 



CYCLOID C^HsOeNs 



Purpuric acid. 



Mohlan, R. Berlin, Ber. D. chem. 

 Ges., 37, 1904, (2686-2G91). 



Ammonium salt 

 C Jl4(XH,).X506 + B^O{Murexide). 



Slimmer, ilax and Stieglitz, Julius. 

 Amer. Chem. J., Baltimore, Md., 31, 

 1904, (661-679). 



CYCLOID C.HTOeNs 



5-Methylpurpuric acid 



.,^ NH.CO (., . .^. n^CO.NH pQ 

 '""^XII.CO'^^-^^- • '^^CO.XH'^'^^ 



and AMMONIUM 7-METUYLrrRrURATE 

 HYDRATE. 



Slimmer, M. and Stieglitz, .1. Amer. 

 Chem. J. Baltimore, -Md., 31, 1904, 

 (661-679). 



CYCLOID CHiOzNs 



Ureideaminoazine. 



Piloty, (). und Finckh, 1\. Liebigs 

 .\nu. Chem., Leipzig, 333, 1904, (22- 

 71). 



CYCLOIDS CoHgO.Ns 



Dimethylpurpuric acids 



p^^XlI.CO ^p NC^^'^^-^'-^^'-'^CO 



and 

 .,,.^X.Me.CO ^p v.r^GO.XII^^,Q 

 *^*^>XMe.COH>*^-^ "^ <C0.X11^^^ 



nvimonlum salts. 



Slimmer, M. and Stieglitz, J. Amer. 

 Chem. J., Ikvltimore, Md., 31, 1901, 

 (()61-G79). 



3 o2 



