acetylcysteine

[uh-seet-l-sis-tee-een, -in, uh-set-, as-i-tl-]
noun Pharmacology.
a substance, C 5 H 9 NO 3 S, used in solution as an inhalant to dissolve mucus in the treatment of chronic bronchitis, asthma, and emphysema and also used as an antidote in acetaminophen poisoning.

Origin:
acetyl + cysteine

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N-acetylcysteine and exacerbations of chronic obstructive pulmonary disease.
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