The subject invention pertains to pharmaceutical compositions, articles of manufacture, and methods useful for treatment of neurological conditions related to, or which can be affected by, modulation of glutamate receptor activity. Particular polyamides include nylon 6, 6 and nylon 6 copolyamides that comprise fluoroether functionalized aromatic amide repeat units. Further, the in-tank tube for an automotive fuel is formed into a monolayer structure formed of a resin material using an aliphatic polyamide resin as a main component, and has the following pressure-resisting characteristic : when silicone oil is charged as a pressurizing medium into the in-tank tube immersed in a test liquid ) at 80\xb0 C.