{2-[(R)-8-(3,4-Dimethoxy-phenyl)-6-[1,3]dioxolan-2-ylethynyl-1,4-dioxa-spiro[4.5]dec-6-en-8-yl]-ethyl}-methyl-carbamic acid methyl ester

{2-[(1S,2R)-1-(3,4-Dimethoxy-phenyl)-2-hydroxy-cyclohexyl]-ethyl}-methyl-carbamic acid methyl ester