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- [6] 1′-(2-Chlorophenyl)-5,6,5′,6′,7′,7a′-hexahydro-1′H,1"H-dispiro[imidazo[2,1-b][1,3]thiazole-2,2′-pyrrolizine-3′(2′H),3"-indole]-2",3(2H,3"H)-dione ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, 2010, 66 : O852 - U2482
- [7] Synthesis and Crystal Structures of 3,3,6,6-tetramethyl-9-(2,4-dichlorophenyl)-3,4,6,7,9,10-hexahydro-2H,5H-acridine-1,8-dione and 3,3,6,6-tetramethyl-9,10-di(4-methoxyphenyl)-3,4,6,7,9,10-hexahydro-2H,5H-acridine-1,8-dione Journal of Chemical Crystallography, 2007, 37 : 483 - 487
- [9] 1 '-(1,3-Diphenyl-1H-pyrazol-4-yl)-2 ',3 ',5 ',6 ',7 ',7a '-hexahydro-1 ' H-dispiro-[acenaphthylene-1,3 '-pyrrolizine-2 ',3 '' chromane]-2,4 ''(1H)-dione ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS, 2013, 69 : O711 - +
- [10] New spiro and condensed heterocyclic systems:: 2,5′ (H)-dioxospiro {indoline-3,8′ (7′a H) pyrimido [4′,5′:4,5] thiazolo [3,2-a] quinazoline}-10′ (9′H) thione & 16(H)-oxoindolo [2&DPRIME;,3":7′,6′] diazepino [4′,5′:4,5] thiazolo [3,2-a] quinazoline-7(9H) thione and their linear isomers INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY, 2001, 10 (03) : 167 - 170