3-Ethynylimidazo[1,2-b]pyridazine943320-61-4100 % similar 3-Bromoimidazo(1,2-b)pyridazine18087-73-550 % similar 3-Ethynylpyridine2510-23-837 % similar Imidazo(1,2-b)pyridazine766-55-237 % similar 2-Ethynylpyridine1945-84-234 % similar 7-Chloropyrazolo[1,5-A]pyrimidine58347-49-232 % similar 5-Bromo-(1,2,4)triazolo(1,5-a)pyridine143329-58-231 % similar