(1R,2R,4R)-Bicyclo[2.2.1]hept-5-ene-2-carboxylic acid (1R,5S,6S)-6-(2,2-dimethyl-propionylamino)-spiro[4.4]non-1-yl ester

(1R,2R,4R)-Bicyclo[2.2.2]oct-5-ene-2-carboxylic acid (1R,5S,6S)-6-(2,2-dimethyl-propionylamino)-spiro[4.4]non-1-yl ester