1ST5554 甲硝唑 Metronidazole 443-48-1 1ST5525 二甲硝咪唑 dimetridazole 551-92-8 1ST5568 罗硝唑 ronidazole 7681-76-7 1ST5556 羟基甲硝唑 Metronidazole-hydroxy 4812-40-2 1ST5539 羟甲基甲硝咪唑 Dimetridazole-2-hydroxy 936-05-0