Synonyms: 2-Carboxy-1,1-dimethylpyrrolidiniumiodide, ester with choline iodide (7CI); Pyrrolidinium,1,1-dimethyl-2-[[2-(trimethylammonio)ethoxy]carbonyl]-, diiodide (9CI);Pyrrolidinium, 2-carboxy-1,1-dimethyl-, iodide, ester with choline iodide(8CI); Choline, iodide, ester with 2-carboxy-1,1-dimethylpyrrolidinium iodide(8CI); Hygronium; LL 1; Trepirium iodide