| tetrahydro-2-oxo-5-(2-propynyloxymethyl)-3-furanacetic aci ethyl ester |
| ethyl 2-oxo-5-(2-propynyloxymethyl)tetrahydro-3-furanacetate |
| 2-acetyl-2-ethoxycarbonylmethyl-4-propargyloxymethyl-gamma-butyrolacton |
| propargyloxymethyl-4 carboethoxymethyl-2 acetyl-2 gamma-butyrolactone |
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