InChI=1/C12H16O3/c13-11-9-7-3-4-8(14-7)10(9)12(15-11)5-1-2-6-12/h7-10H,1-6H2/t7-,8+,9-,10+/m1/s rel-(3a'R,4'S,7'R,7a'S)-hexahydro-3'H-spiro[cyclopentane-1,1'-[2,8]dioxa[4,7]epoxy[2]benzofuran]-3'-one