Chemical Name: Bis[(1RS)-[[(1-methylethoxy)carbonyl]oxy]ethyl](6R,7R,6'S,7'S)-7,7'-[carbonylbis[imidazole-2,4-diyl[(2Z)-2-(methoxyimino)-1-oxoethane-2,1-diyl]imino]]bis[3-(methoxymethyl)-8-oxo-5-thia-1-azabicylo[4.2.0]oct-2-ene-2-carboxylate]
Synonym: Hydroxychloroquine USP related impurity a ; Desethylhydroxychloroquine