Abstract
Latex of E. tirucalli [a horse hold plant whose latex produces Uveitis and kerato conjunctivitis in dog eyes and exhibits tumor-promoting activity on mouse skin] collected in Colombia yielded 12-O-2Z-4E-octadienoyl-4-deoxyphorbol-13-acetate, which exhibited an irritant potency a mouse ear test system. The unsaturated 4-deoxyphorbol diesters recently reported in E. tirucalli grown in South Africa were not observed in the present study.

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