3-苯基-3,7A-二氢-1H-吡咯并[1,5-c]恶唑-5-酮

(+)-(3R,7aS)-四氢-3-苯基-3H,5H-吡咯并[1,2-c]噁唑-5-酮

bicyclic (2R,5R,6R)-6-hydroxy-2-phenyl-3-oxa-1-azabicyclo(3.3.0)octan-8-one

(2R,3S)-1-benzyl-3-tert-butyldimethylsilyloxy-2-hydroxymethylpyrrolidine