2-hydroxy-N-[3-[3-(1-piperidylmethyl)phenoxy]propyl]acetamide HOE-062 Roxatidine Acetate Impurity 1 2-hydroxy-N-(3-(3-(piperidin-1-ylmethyl)phenoxy)propyl)acetamide hydrochloride 2-hydroxy-N-[3-[3-(piperidin-1-ylmethyl)phenoxy]propyl]acetamide Roxatidine Impurity 1 1-(3-(3-(2-acetoxyacetamido)propoxy)benzyl)piperidine 1-oxide Clofazimine Impurity 2(Clofazimine EP Impurity B)