Synonyms: 3-Hydroxy-1,1-dimethylpyrrolidiniumbromide, benzilate (7CI); Pyrrolidinium,3-[(hydroxydiphenylacetyl)oxy]-1,1-dimethyl-, bromide (9CI); Pyrrolidinium,3-hydroxy-1,1-dimethyl-, bromide, benzilate (8CI);1,1-Dimethyl-3-hydroxypyrrolidinium bromide benzilate; Benzilic acid, esterwith 3-hydroxy-1,1-dimethylpyrrolidinium bromide; Benzopyrronium bromide