Chemical Name: (6R,7R)-7-[[(2Z)-2-(2-aminothiazol-4-yl)-2-(methoxyimino)acetyl]amino]-3-(methoxymethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Calcium salt (as per EP)
Synonym: Hydroxychloroquine USP related impurity c ; Hydroxychloroquine O-Sulfate