(2S,4a′R,5′R,6′S,8a′R)-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

(2S,4a′R,5′R,6′S,8a′R)-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-2′,8′a-dimethyl-6′-(1-methylethenyl)-6-(3-pyridinyl)-, (2S,4a′R,5′R,6′S ,8a′R)-

15-deoxyoxalicine A