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- [25] Tetrakis(1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidin-9-ido-κ2N1,N9)niobium(V) hexafluorido-phosphate ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, 2008, 64 : M1197 - U868
- [26] IMIDAZO[1',2'(3,4)]PYRIMIDO[6,1-A]ISOQUINOLINE AND PYRIMIDO[1',2'(3,4)]PYRIMIDO[6,1-A]ISOQUINOLINE RING-SYSTEMS BY TANDEM CYCLIZATION SYNTHESIS-STUTTGART, 1995, (07): : 863 - 867
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- [28] Crystal structures of sulfonamide protected bicyclic guanidines: (S)-8-{[(tert-butyldimethylsilyl)oxy]methyl}-1-[(2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl]-1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidin-1-ium trifluoromethanesulfonate and (S)-8-(iodomethyl)-1-tosyl1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]-pyrimidin-1-ium iodide ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS, 2024, 80 : 305 - +
- [29] 9,9a-diphenyl-1,3,4,6,7,9a-hexahydro-2H-pyrazino[1,2-a]pyrimidine at 130 K ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, 2006, 62 : O1846 - O1848