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Linezolid (LZD) is one of the first commercially available synthetic oxazolidinone antibiotics and is widely used for the treatment of multidrug-resistant Gram-positive bacterial infection.LZD was found to have five polymorphic forms.The most stable and commercialized polymorphs are known as form Ⅱ and form Ⅳ.Form Ⅱ and form Ⅳ are enantiotropically related to each other.