6-Chloroimidazo[2,1-b]thiazole23576-81-0100 % similar 6-Chloroimidazo[2,1-b]thiazole-5-carboxaldehyde23576-84-335 % similar 6-Chloroimidazo[1,2-a]pyrazine76537-23-034 % similar 2,4-Dichlorothiazole4175-76-231 % similar