2,3-Pyridinedicarboxylicanhydridefuro[3,4-b]pyridine-5,7-dione2,3-PYRIDINEDICARBOXYLIC ANHYDRIDE2,3-Pyridinedicarboxylic anhydride喹啉酸酐Quinolinic anhydride2,3-吡啶二羧酸酐2,3-Pyridinedicarboxylic Acid AnhydrideNSC 44309Furo[3,4-b]pyridine-5,7-dione2,3-Pyridinedicarboxylic AnhydrideQuinolinic Acid AnhydrideQuinolinic AnhydridePyridinic Anhydride吡啶-2,3-二甲酸酐Pyridine-2,3-dicarboxylic anhydride