What is the difference between Myodil and Pantopaque chemical formula?

Myodil (UK) and Pantopaque (USA) was an old oil based contrast medium that was used in x-ray.
However, the Chemical formula was different.
What are those differences?
And how would such differences react within the CSF of the body and through daughtering.
Thank you.

Answer:
Myodil and Pantopaque were exactly the same product, just named differently. The chemical formula is C19H29IO2, with the IUPAC name is ethyl 10-(2-iodophenyl)undecanoate.
Structure picture can be found here : http://redpoll.pharmacy.ualberta.ca/drug...

Iophendylate is a myelographic oil-ester initially introduced for use in small amounts (1-2cc) for locating spinal tumors. Later, it was found to cause adhesive arachnoiditis. Because these substances are hyperbaric once they were placed in the subarachnoid space they would migrate to the distal portion, where they remained, producing progressive scarring.

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