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OpicaponeImpurity13 Opicapone Impurity 18 QJOAGGIONCIMFQ-UHFFFAOYSA-N 5-(3-(2,5-Dichloro-4,6-dimethylpyridin-3-yl)-1,2,4-oxadiazol-5-yl)-3-nitrobenzene-1,2-diol 1,2-Benzenediol, 5-[3-(2,5-dichloro-4,6-diMethyl-3-pyridinyl)-1,2,4-oxadiazol-5-yl]-3-nitro- (4E)-4-[3-(2,5-dichloro-4,6-dimethylpyridin-3-yl)-2H-1,2,4-oxadiazol-5-ylidene]-2-hydroxy-6-nitrocyclohexa-2,5-dien-1-one