1H-Imidazo[1,2-b]pyrazole, 2,3-dihydro- 2,3-Dihydro-1H-imidazo[1,2-b]pyrazole 6714-29-0 BA 21381 IMPY Imidazole-Pyrazole NSC174124 Pyrazolo[2,3-a]imidazolidine