Synonyms: (1-Carboxy-2-indol-3-ylethyl)trimethylammoniumhydroxide, inner salt (7CI); 1H-Indole-3-ethanaminium, a-carboxy-N,N,N-trimethyl-, innersalt, (S)-; Ammonium, (1-carboxy-2-indol-3-ylethyl)trimethyl-, hydroxide, innersalt (8CI); Hypaphorine (6CI); (+)-Hypaphorine; Glyyunnanenine; L-Hypaphorine;Lenticin; Lenticine; Tryptophan betaine; Tryptophan, trimethylbetaine