[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][C][C][C][C][C][C][C][C][C][C@@H1][Branch2][Ring1][Ring1][C][C@H1][C@@H1][Branch1][Branch2][C][=Branch1][C][=O][O][Ring1][Branch1][C][C][C][C][C][C][O][C][=Branch1][C][=O][C@H1][Branch1][#Branch1][C][C][Branch1][C][C][C][N][C][=O]"}, {"from": "gpt", "value": "The molecule is a reversible active-site inhibitor of gastrointestinal lipases.  Orlistat forms a covalent bond with the active serine site in gastric and pancreatic lipases, thereby inhibiting their activity and preventing dietary fat from being hydrolyzed and absorbed. (NCI04)"}]