"Iofendylate (generic names: ethyl 10-(4-iodophenyl)undecanoate or iodophenylundecylic acid)and sold under the tradename Myodil (except the USA where it was marketed as Pantopaque) was an oil-based contrast medium used for myelography."
Line 1:229·'USA' has no definition. Spell it out if it's unfamiliar to the audience.