(3S,5S,8R,10S)-3-benzyloxycarbonylamino-8-hydroxy-10-triethylsilyloxy-1-oxaspiro[4,5]dec-6-en-2-one

(3S,5S,6R,7R,8R,10S)-3-benzyloxycarbonylamino-6,7-epoxy-8-hydroxy-10-triethylsilyloxy-1-oxaspiro[4,5]dec-6-en-2-one