3,4-dichloro-N-methyl-N-(3-methylene-2-oxo-8-(1-pyrrolidinyl)-1-oxaspiro(4,5)dec-7-yl)benzeneacetamide, (5alpha,7beta,8alpha)-(+)(-)-isomer
3,4-dichloro-n-methyl-n-(3-methylene-2-oxo-8-(1-pyrrolidinyl)-1-oxaspiro(4,5)dec-7-yl)benzeneacetamide, (5alpha,7beta,8alpha)-(+)(-)-isomer