2H-Cyclopenta[b]furan-2-one,3,3a,6,6a-tetrahydro-, (3aS-cis)-; (+)-(3aS,6aR)-3,3a,6,6a-Tetrahydro-2H-cyclopenta[b]furan-2-one;(1R,5S)-(+)-2-Oxabicyclo[3.3.0]oct-6-en-3-one;(1R,5S)-2-Oxabicyclo[3.3.0]oct-6-en-3-one
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