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4-Hydroxyphenylacetic acid is a chemical compound found in olive oil and beer.
H 1670 (OTTO) 4-Hydroxyphenylacetic acid, 97%+ Cas 156-38-7 - used in the acylation of phenols and amines. 4-Hydroxyphenylacetic acid is obtained by reducing 4-hydroxymandelic acid with elemental phosphorus and iodine.