1,7-Dimethyl-5-phenyl-2-(3-thenoylaminomethyl)-2,3-dihydro-1H-1,4-benzodiazepin-4-ium Chloride

The seven-membered ring of C₂₃H₂₄N₃OS⁺.Cl^- has a conformation halfway between a distorted boat and a distorted sofa. The 3-thenoylaminomethyl moiety is in an extended conformation. This conformation is stabilized by two hydrogen bonds with the chloride anion, one from the protonated basic N atom of the heptadiene ring and another from the amidic N atom. The thienyl ring shows 180° rotational disorder.

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