👉 The 739 is an enzyme and 811443 is a chemical. The acetic acid bond (3) in the middle of the molecule represents the carboxyl group, 2R is a carboxylic acid, and the sulfur atom (2S) represents a substituion position.
739. 811443-27-3; (1R,2S,3R,4R,6S)-3-aminotricyclo[2.2.1.02,6]heptane-1,3-dicarboxylic acid