p. 1461 - 1462
(2007/10/03)3-(4-chloro-phenyl)-6,7-dihydro-pyrazolo[4,3-e][1,2,4]triazolo[4,3-c]pyrimidin-5-one
oxypurinol
4,5-Dihydro-4-thioxo-1H-pyrazolo[3,4-d]pyrimidin-6(7H)-one
4-{N'-[1-(4-Chloro-phenyl)-meth-(E)-ylidene]-hydrazino}-1,7-dihydro-pyrazolo[3,4-d]pyrimidin-6-one
N-(4-chloro-benzylidene)-N'-(6-chloro-1H-pyrazolo[3,4-d]pyrimidin-4-yl)-hydrazine