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Butoconazole Nitrate (CAS 64872-77-1) is a synthetic imidazole derivative antifungal agent featuring a complex molecular structure with a 1H-imidazole core linked to a chlorophenyl-substituted butyl chain and a dichlorophenylthio moiety. The molecule's chemical name is 1-[4-(4-chlorophenyl)-2-[(2,6-dichlorophenyl)thio]butyl]imidazole nitrate, with the nitrate counterion stabilizing the imidazole nitrogen.

Propafenone Hydrochloride (CAS 34183-22-7) is a synthetic class Ic antiarrhythmic agent featuring a propiophenone core with an ether-linked hydroxypropylamino side chain. The molecule's chemical name is 1-[2-[2-hydroxy-3-(propylamino)propoxy]phenyl]-3-phenyl-1-propanone hydrochloride . Structurally, Propafenone Hydrochloride incorporates a 3-phenylpropiophenone backbone with a 2-hydroxy-3-(propylamino)propoxy substituent at the 2'-position, stabilized as the monohydrochloride salt .

Adiphenine Hydrochloride (CAS 50-42-0) is a synthetic anticholinergic agent that functions as a non-competitive inhibitor of nicotinic acetylcholine receptors (nAChRs). The molecule's chemical name is 2-diethylaminoethyl diphenylacetate hydrochloride, featuring a diphenylacetate ester linked to a diethylaminoethyl moiety, stabilized as the monohydrochloride salt . Structurally, Adiphenine Hydrochloride incorporates a diphenylmethyl group that contributes to its receptor-binding affinity and a tertiary amine that is protonated in the salt form.

Melitracen Hydrochloride is a tricyclic antidepressant (TCA) with a unique anthracene-derived structure, featuring a dimethylamino propylidene side chain and a dimethylated central ring system. The molecular architecture of Melitracen Hydrochloride enables its activity as a potential dopamine D1/D2 receptor antagonist, distinguishing it from other TCAs that primarily target serotonin and norepinephrine reuptake.

Opicapone (BIA 9-1067) is a potent, long-acting third-generation catechol-O-methyltransferase (COMT) inhibitor developed for the treatment of Parkinson's disease and motor fluctuations. The molecular structure of Opicapone features a nitrocatechol moiety linked to a dichlorodimethylpyridine N-oxide ring via an oxadiazole bridge, enabling reversible binding to the COMT enzyme.