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Dr. Harris Isbell, M.D., Director Addiction Research Center.
National Institutes of Mental Health U.S. Public Health Service Hospital Box 2000
Lexington, Kentucky

Dear Dr. Isbell:

I have finally been able to get a copy of a paper reporting the first work on the barbiturate inhibitor which I sent you some weeks ago. I hope that this will provide sufficient information so that you can proceed with some experimental work, As l get more information, I will pass it on. The particular compound that you have is the plain l, 4 endoxy-haxahydropithaimide and is of the same batch that was Lsed in the reported experiments.

I hope that I will get a chance to visit you in the near future.

Sincerely yours,

Enclosure: Copy of paper on barbiturate inhibitor

TSS/(25 Jan 57)

Declassified by187475 ate 4 FEB 1977

A—265

25 January 1057