(2R,4a′R,5′S,6′S,8a′S)-6′-Hydroxy-6′-isopropenyl-2′,8a′-dimethyl-6-(3-pyridinyl)-4′,4″,4a′,5″,6′,7′,8′,8a′-octahydro-3H,4H,6″H-dispiro[furo[3,2-c]pyran-2,1′-naphthalene-5′,3″-pyran]-4,6″-dione

(2R,4a′R,5′S,6′S,8a′S)-6′-Hydroxy-6′-isopropenyl-2′,8a′-dimethyl-6-(3-pyridinyl)-4′,4″,4a′,5″,6′,7′,8′,8a′-octahydro-3H,4H,6″H-dispiro[furo[3,2-c]pyran-2,1′-naphthalene-5′,3″-pyran]-4,6″-dione

Dispiro[4H-furo[3,2-c]pyran-2(3H),1′(5′H)-naphthalene-5′,3″(6″H)-[2H]pyran]-4,6″-dione, 4′,4″,4′a,5″,6′,7′,8′,8′a-octahydro-6′-hydroxy-2′,8′a-dimethyl-6′-(1-methylethenyl)-6-(3-pyridinyl)-, (2R,4 a′R,5′S,6′S,8a′S)-

15-deoxyoxalicine B