Cyclopropanecarboxylic acid,1-[[[(5S,8S)-7-[(2S)-2-[[(cyclopentyloxy)carbonyl]amino]-3,3-dimethyl-1-oxobutyl]-3-ethyl-1-oxa-2,7-diazaspiro[4.4]non-2-en-8-yl]carbonyl]amino]-2-ethenyl-, (1R,2S)-