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Oxazolo[4,5-b]pyridine OXAZOLO[4,5-B]PYRIDIN-2-AMINE Linezolid 2,3-Dihydropyrido[2,3-d][1,3]oxazol-2-one Oxazolo[4,5-c]pyridin-2(3H)-one OXAZOLO[4,5-B]PYRIDIN-2(3H)THIONE Oxazolo[5,4-b]pyridin-2(1H)-one (6CI,9CI)