Pyridopyridazinone or pyridopyridazine-thione compound, intermediate for preparing it, pharmaceutical composite containing the same and its use.
吡啶并哒嗪酮或吡啶并哒嗪硫酮化合物,制备它的中间体,含它的药物组合物及其用途。
2
L-Thiazolidine-2-thione-4-carboxylic acid ethyl ester was prepared from L-thiozolidine-2-thione-4-carboxylic acid and ethyl alcohol in the presence of the hydrate of ferric sulfate.