87376-66-7 Spiro(furan-3(2H),6'-(6H)naphtho(1,8-bc)furan)-2,2'(4'H)-dione,5-(3-furanyl)-4,5,5',5'a,7',8',8'a,8'b-octahydro-8'b-(hydroxymethyl)-7'-methyl-, (3R,5S,5'aS,7'R,8'aR,8'bR)-