英文别名Liothyronine Impurity 13; levothyroxine N-methylamide; (2S)-2-amino-3-[4-(4-hydroxy-3,5-diiodophenoxy)-3,5-diiodophenyl]-N-methylpropanamide; L-Thyroxine-N-methylamide; N-Methylamide Levothyroxine; Levothyroxine N-Methylamide (USP); Levothyroxine Impurity 49; Levothyroxine USP Impurity b 
