Cycloids containing nitrogen. 556 



1932 



Indirubin 

 NH< C L « JJ 4 >C : C<£ °>C,H 4 



DlBBOMO, NlTRO-, and METHYL- 

 DERIVATIVES. 



Wahl et Bagard. Bl. [4], 15 



CYCLOID C lf H 1; 2 N 2 



Hexamethylpyrrindoquinone 



m , CMe.C.C* i C.NMe^nM 



NMe.C.< O.CCMe 



Also dimethyldiethylpyrrindo- 



quinone. 

 PUoty et alii. A ., 407, (1 -42). 



CYCLOID CnHsO.Nz 



Methyl- 1 -indirubin 



C 8 H 4 <£ 7 g>C : C<^*>NMe 



Wahl et Bagard. Bl. [4], 15, (341). 



Methylisoindigotin 



NH<^ 4 >C : C< C ^*>NMe 



Wahl et Bagard. Bl. [4], 15, (339). 



CYCLOID C 18 H 18 4 N, 



2 : 3-Diphenylpiperazine 2 : 3- 

 dicarboxylic acid 



vw 0Ph(CO 2 Hi. ^,.,,, ,.,. a 

 Nfl <CH 2 .CH 2 .NH >CPh - CO * H 



Schlesinger. B., 47, (2406); Z., 46, 



(1579). 



CYCLOID C 21 H 16 3 N 2 

 Tri-o-oxy-triphenyl-glyoxaline 



C(C 6 H 4 OH) : C.C 6 H 4 OH 

 Cousin et Volmar. Bl. [4], 15, (419). 



CYCLOIDS WITH TWO NITROGEN 

 ATOMS, OXYGEN AND SULPHUR. 



CYCLOID C<H 6 ON 2 S 



£-Methylthiohydantoin 

 CS.NMe^ firr 



P>L11 2 

 NH.CO 



and the 7-PHENYL COMPOUND. 



Komatsu. 112447. 



CYCLOID C;H 12 ON 2 S 



e-iso-Butylthiohydantoin 

 >CH.CH 2 .CHMe, 



CS.NB 



NH.CO 



and the j9-acetyl derivative. 

 Komatsu. 112447. 



CYCLOID C.,H t 0N 2 S 

 o-Phenylthiohydantoin 



9 S - NH >CHPh 



NH.CO 



and the /8-acetyldeiuvative. 

 Komatsu. 112117. 



CYCLOID C, H, 0N 2 S 



7-Phenyl-/3-methyl-thiohydantoin 



,X.\Ie.CH 2 

 "NPh.CO 

 Komatsu. 112447. 



( !S< 



CYCLOIDS WITH THREE OR 



MORE NITROGEN ATOMS AND 



OXYGEN. 



CYCLOID C5H5O5NJ 



Uramil 7-carboxylic acid 

 CO<^gQQ>CH.NH.CO I B 



ESTEES and DERIVATH I S. 



BUtz. A., 404, (202). 



CYCLOID C 7 H,0 6 N 3 

 1:3: Dimethyluramil 7-carboxylic 



acid CO< 



\.\Ie.('(U'Il.MI.(JU,H 



NMe CO 



Biltz u. Strufe. A., 404, (148 ... 



CYCLOID C ; H 10 5 N4 



o-0xy-4 niethylimino-i methylhy- 



dantoyl-carbamic acid. 



Ethyl ether of the ethyl esteb 



co< NMe.C(OEt).CO.NH.CQ 2 Et 



NH.C:NMe 

 Biltz a. Damm. A., 406, (59). 



CYCLOID C,HhO,N 4 



Carnosine 



(Hisl'idine + ^-alanine— H t O). 

 Mauthner. M., 34, (883). 



