Dear Coquim;
At least the >C=O Group is called a “Chromophore” with a “weak” Absorption near ~300 nm.
Where exactly your “Succinic Anhydride” will absorb I’m not able to tell you, but in your constellation of two such chromophores combined with an –O– bridge should make it even better detectable.
I hope it may be of help anyway.
Good Luck!
ARGOS++