Showing structure for (1s,3r,4's,4ar,5s,6r,6ar,10as,10bs)-6-(benzoyloxy)-4',5-dihydroxy-4a,6a,7,10b-tetramethyl-5'-oxo-2,5,6,9,10,10a-hexahydro-1h-spiro[naphtho[2,1-b]pyran-3,3'-oxolan]-1-yl pyridine-3-carboxylate