2420-92-0

Pyrazine tetracarboxylic acid dianhydride difuro[5,4-a:5',4'-e]pyrazine-1,3,5,7-tetrone Difuro[3,4-b:3',4'-e]pyrazine-1,3,5,7-tetraone 1H,3H-Difuro[3,4-b:3',4'-e]pyrazine-1,3,5,7-tetrone 1H,3H-difuro[3,4-b:3',4'-e]pyrazine-1,3,5,7-tetraone