英文别名DL-5-indolylmethylhydantoin; 5-indol-3-ylmethyl-imidazolidine-2,4-dione; 5-Indol-3-ylmethyl-imidazolidin-2,4-dion; hydantoine of DL-tryptophane; 5-((1H-Indol-3-yl)methyl)imidazolidine-2,4-dione; Tadalafil Impurity 63; 2,4-Imidazolidinedione, 5-(1H-indol-3-ylmethyl)-; Tryptophan Impurity 46; Tadalafil Impurity 109 
