This is an example of:

Competitive Inhibitors:  In competitive inhibition, the inhibitor (I) binds to the substrate-binding portion of the active site thereby blocking access by the substrate.  The structures of most classic competitive inhibitors, therefore, tend to resemble the structure of a substrate, and thus are termed substrate analogs.  Inhibition of the enzyme succinate dehydrogenase by malonate illustrates competitive inhibition by a substrate analog. Key Concept: Competitive inhibition occurs when the inhibitor binds reversibly to the same site that the substrate would normally occupy and, therefore, competes with the substrate for that site. Ref: Lippincott’s illustrated reviews for biochemistry, 7th edition.