三嗪环，英文名称为Thiotriazinone，别名为三嗪酸，分子式为C4H5N3O2S，CAS号为58909-39-0，用作头孢曲松钠、头孢三嗪钠等药物的中间体。2，5-Dihydro-6-Hydroxy-2-Methyl-3-Mercapto-5-Oxo-1，2，3-Triazine; Tetrahydro-2-methyl-3-thioxo-1，2，4-triazine-5，6-dione; TTZ; 3-Mercapto-2-Methyl-5-oxo-6-Hydroxy-1，2，4-Triazine; 2-methyl-3-thioxo-1，2，4-triazinane-5，6-dione