(7E)-3,4,5,6,9,10-hexahydro-2H-oxecin-2-one 2H-oxecin-2-one, 3,4,5,6,9,10-hexahydro-, (7E)- InChI=1/C9H14O2/c10-9-7-5-3-1-2-4-6-8-11-9/h2,4H,1,3,5-8H2/b4-2