(6E)-3,4,5,8,9,10-hexahydro-2H-oxecin-2-one 2H-oxecin-2-one, 3,4,5,8,9,10-hexahydro-, (6E)- InChI=1/C9H14O2/c10-9-7-5-3-1-2-4-6-8-11-9/h1-2H,3-8H2/b2-1