Trans-4-(Maleimidomethyl)cyclohexanecarboxylic acid is a bifunctional organic compound featuring a maleimide group and a carboxylic acid group, separated by a rigid cyclohexane spacer. The maleimide moiety is highly reactive towards thiol groups via Michael addition under mild conditions, while the carboxylic acid can be readily activated for amide bond formation. This compound is primarily utilized as a heterobifunctional crosslinker in polymer science and materials chemistry. Its main application is in the synthesis of functional polymers, hydrogels, and surface coatings, where it enables the site-specific conjugation of thiol-containing molecules (e.g., peptides, proteins, polymers) to amine-containing substrates or surfaces. The trans configuration of the cyclohexane ring provides structural rigidity, which can influence the final material's properties. It serves as a key building block for creating advanced polymeric materials with tailored functionalities, such as stimuli-responsive networks, bioconjugates, and functionalized nanoparticles for biomedical or industrial applications.