(1,3'-BIPYRROLIDINE)-2,2',5,5'-TETRONE, 1'-(2,6-XYLYL)- (1,3'-Bipyrrolidine)-2,2',5,5'-tetrone, 1'-(2,6-dimethylphenyl)- 1'-(2,6-Xylyl)(1,3'-bipyrrolidine)-2,2',5,5'-tetrone 69557-08-0