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Deduce the identity of the following compound from the NMR data given.
C4H6O2: 1H NMR, δ 2.28 (2H, multiplet), 2.50 (2H, triplet), 4.35 (2H, triplet);
13C NMR, δ 177.81 (singlet), 68.58 (triplet), 27.70 (triplet), 22.17 (triplet) (ppm)
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