rac-(2R,2'S,3a'S,6'S,7a'R)-6'-((benzyloxy)methyl)octahydrodispiro[oxirane-2,3'-benzofuran-2',2''-pyran]-4''(3''H)-one

(2R,2'S,3a'S,6'S,7a'R)-6'-((benzyloxy)methyl)octahydrodispiro[oxirane-2,3'-benzofuran-2',2''-pyran]-4''(3''H)-one

(2S,3aS,6S,7aR)-6-((benzyloxy)methyl)octahydro-3H-spiro[benzofuran-2,2'-pyran]-3,4'(3'H)-dione

rac-(2R,3aR,5'R,6R,7aS)-6-((benzyloxy)methyl)-5'-methyloctahydro-3H-spiro[benzofuran-2,2'-pyran]-3,4'(3'H)-dione