(5S,6S)-6-Azido-spiro[4.4]non-2-en-1-one

N-((1S,5S,6R)-6-Hydroxy-spiro[4.4]non-1-yl)-2,2-dimethyl-propionamide

2,2-Dimethyl-N-((1S,5S)-6-oxo-spiro[4.4]non-1-yl)-propionamide

Acrylic acid (1R,5S,6S)-6-(2,2-dimethyl-propionylamino)-spiro[4.4]non-1-yl ester

(E)-But-2-enoic acid (1R,5S,6S)-6-(2,2-dimethyl-propionylamino)-spiro[4.4]non-1-yl ester