b-methylglutaconyl-CoA
3-methylglutaconyl-CoA
trans-3-methylglutaconyl-CoA

C27H42N7O19P3S

It's an acyl-CoA (C3 methylated, and that has a second carbonyl group at C5 and a double linkage at C2).

Catabolism of isoleucine, leucine and tryptophan (3D)
Catabolism of phenylalanine, tyrosine and leucine (3D)

The reactions of the listed pathways are the same (click on the pathways links to see them).