1,1'-(Oxybis(methylene))bis(1H-pyrrole-2,5-dione) 15209-14-0 1H-Pyrrole-2,5-dione, 1,1'-(oxybis(methylene))bis- AI3-61981 Bis(N-maleimidomethyl)ether N,N'-(Oxydimethylene)dimaleimide