3(S)-(cyanomethyl)-5,10-dimethoxy-3,4-dihydro-1H-naphtho<2,3-c>pyran-1(S)-spiro-2'-4'(S)-acetoxy-3'(S)-(methoxymethoxy)-6'(S)-methyltetrahydropyran

3(R)-(cyanomethyl)-5,10-dimethoxy-3,4-dihydro-1H-naphtho<2,3-c>pyran-1(S)-spiro-2'-4'(S)-acetoxy-3'(S)-(methoxymethoxy)-6'(S)-methyltetrahydropyran