2-butylglycerol, and/or 2-methyl fattyacids were synthesized. The triacylglycerol analogues were tested for their ability to form stable monomolecularfilms at the air/waterinterface by recording their surface-pressure/molecular-area compression isotherms. The inhibition of human pancreatic and gastric lipases by the sterically hindered triacylglycerol analogues was studied by using the monolayer