Brevione I

(2S,4′S,4a′R,4b′S,8a′R,10a′R)-4′-Hydroxy-2′,4b′,6,7,8′,8′,10a′-heptamethyl-4a′,8′,8a′,9′,10′,10a′-hexahydro-3H,4H,4′H-spiro[furo[3,2-c]pyran-2,1′-phenanthrene]-4,7′(4b′H)-dione

Brevione I

Spiro[4H-furo[3,2-c]pyran-2(3H),1′(4′H)-phenanthrene]-4,7′(8′H)-dione, 4′a,4′b,8′a,9′,10′,10′a-hexahydro-4′-hydroxy-2′,4′b,6,7,8′,8′,10′a-heptamethyl-, (2S,4′S,4a′R,4b′S,8a′R,10a′R)-