(3aR,6aS)-3,3a,6,6a-tetrahydro-2H-cyclopenta[b]furan-2-one 2H-cyclopenta[b]furan-2-one, 3,3a,6,6a-tetrahydro-, (3aR,6aS)- InChI=1/C7H8O2/c8-7-4-5-2-1-3-6(5)9-7/h1-2,5-6H,3-4H2/t5-,6-/m0/s