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1. any of a class of organic compounds formed by combination of an aldehyde molecule and two alcohol molecules. 2. CH3CH(OC2H5)2, a colorless, volatile liquid used as a solvent and in cosmetics.
Acetylcholine (ACh) is an organic chemical that functions in the brain and body of many types of animals, including humans, as a neurotransmitterâa chemical released by nerve cells to send signals to other cells. Its name is derived from its chemical structure: it is an ester of acetic acid and choline.