(2S,5S,6R)-2-Benzyloxymethyl-6-non-2-ynoyl-1-aza-spiro[4.5]decane-1-carboxylic acid tert-butyl ester

(2S,5S,6R)-2-Benzyloxymethyl-6-(1-hydroxy-non-2-ynyl)-1-aza-spiro[4.5]decane-1-carboxylic acid tert-butyl ester