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An acetal is a functional group with the following connectivity R 2 C(OR') 2, where both R' groups are organic fragments. The central carbon atom has four bonds to it, and is therefore saturated and has tetrahedral geometry.
/acÂ·eÂ·tylÂ·choÂ·line/ (ACh) (asâ³Ä-til-) (asâ³Ä-tÄl-koÂ´lÄn) the acetic acid ester of choline, which is a neurotransmitter at cholinergic synapses in the central, sympathetic, and parasympathetic nervous systems; used in the form of the chloride salt as a miotic.t is a neurotransmitter at cholinergic synapses in the central, sympathetic and parasympathetic nervous systems. It is not used clinically but it is the classical cholinergic agonist. Abbreviated ACh. acetylcholine receptors. structures located at the endorgans, e.g. at the skeletal muscle fibers.