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The structure-activity relationships of some tetracyclic heterocycles
related to Brequinar were explored. Activities as inhibitors of dihydr
oorotate dehydrogenase and the mixed lymphocyte reaction are related t
o ring system, heteroatom placement, and pendant ring substitution. (C
) 1998 The DuPont Merck Pharmaceutical Company. Published by Elsevier
Science Ltd.