text: Multiple new inhibitors based on non-carbohydrate templates have been synthesized. With focus on positioning the double bond in the inhibitor to more closely resemble the transition state of the substrate and replacing the glycerol side chain with a lipophilic group on the basis of the hydrophobic backbone of the glycerol interacting with the protein lead to the discovery of GS 4071. GS 4071 is cyclohexene based and has 3-pentyl ether, found to be optimal, instead of the glycerol as the side chain. The GS 4071 inhibitor is more lipophilic than the predecessor Zanamivir but does not have more bioavailability. Oseltamivir, the ethyl ester of GS 4071 was produced as a prodrug  and is actively converted to the active drug in vivo.