(1S,4R)-2-Aza-bicyclo[2.2.1]hept-5-en-3-one ; (+)-2-Azabicyclo[2.2.1]hept-5-en-3-one ; (1S)-(+)-2-Azabicyclo[2.2.1]hept-5-en-3-one ; (1S,4R)-(+)-2-Azabicyclo[2.2.1]hept-5-en-3-one ; (1S,4R)-2-Azabicyclo[2.2.1]hept-5-en-3-one;