Place 49 g of phthalic anhydride in an amber bottle and dissolve it in 300 ml of pyridine that has been freshly distilled over phthalic anhydride.

• 将49克邻苯二甲酸酐放入琥珀瓶里，倒入300毫升的嘧啶(在刚才准备邻苯二甲酸酐的过程中蒸馏好的)稀释。