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A 5288 (OTTO) 4-Acetylbutyric acid, 97% Cas 3128-06-1 - used in the preparation of 5-hydroxyhexanoic acid. A 5288 (OTTO) 4-Acetylbutyric acid, 97% Cas 3128-06-1 - 6-methyl1-3,4-dihydro-pyran-2-one, precursor for 5-acetyl-tetrahydro-2-(3H)-furanone