(3aα,4α,7α,7aα)-hexahydro-4,7-epoxyiso-benzofuran-1(3H)-one

(2R,3R)-2-cyanomethyl-3-methoxycarbonyl-7-oxabicyclo<2.2.1>heptane

((1S,2R,3S,4R)-3-Hydroxymethyl-7-oxa-bicyclo[2.2.1]hept-2-yl)-acetonitrile

(1S,2R,6R,7R)-4,10-Dioxa-tricyclo[5.2.1.02,6]dec-8-en-3-one