label: butropium
label_lc: butropium
description: "A carboxylic ester resulting from the formal condensation of the carboxy group of (2S)-3-hydroxy-2-phenylpropanoic acid with the hydroxy group of (3-endo)-8-(4-butoxybenzyl)-3-hydroxy-8-methyl-8-azoniabicyclo[3.2.1]octane. Its bromide salt is used as an  antispasmodic drug."