Synonyms: 113981-44-5; Firstcin (TN); Imidazo[1,2-b]pyridazinium, 1-[[(6R,7R)-7-[[(2Z)-2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(methoxyimino)acetyl]amino]-2-carboxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl]methyl]-, chloride (1:1); Firstcin; Cefozopran hydrochloride; CZOP; Cefozopran (hydrochloride); Cefozopran monohydrochloride; UNII-060I5C0GRC; CID5491954; AC1NUSQM; Cefozopran hydrochloride (JP17); AKOS030526075; AN-9459; D02233; I06-1800; (6R,7R)-7-[[(2Z)-2-(5-amino-1,2,4-thiadiazol-3-yl)-2-methoxyimino-acetyl]amino]-3-(imidazo[1,2-b]pyridazin-4-ium-1-ylmethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid chloride; (6R,7R)-7-[[(2Z)-2-(5-amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetyl]amino]-3-(imidazo[1,2-b]pyridazin-4-ium-1-ylmethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid chloride;