(S)-3,3-dimethyl-dihydropyrrolo[1,2-c]oxazol-5(1H,3H,6H)-one;3,3-dimethyl-tetrahydro-pyrrolo[1,2-c]oxazol-5-one;(5S)-2,2-dimethyl-8-oxo-1-aza-3-oxabicyclo[3.3.0]octane;(5S)-1-aza-2,2-dimethyl-3-oxa-8-oxo-bicyclo[3.3.0]octane;(5S)-2,2-dimethyl-3-oxa-1-azabicyclo[3.3.0]octan-8-one;
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