1-Oxacephem derivatives were evaluated as a novel series of chymase inhibit
ors. The structure-activity relationship studies of 1-oxacephems led to com
pounds 15, which exhibited 27 nM inhibition of human chymase and improvemen
t of stability in human plasma (t(1/2) 1.5 h), (C) 2000 Elsevier Science Lt
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