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The tetracyclic polyfunctional diterpene ingenol (1) is the prototype of many diterpenoid parent alcohols of the ingenane type. Esters of these parent alcohols occur -partly together with esters of polyfunctional diterpene parent alcohols of the tigliane and daphnane type -as irritant, cocarcinogenic and antineoplastic principles in species of the family Euphorbiaceae (Spurge). Preparation of 1 from latex of Euphorbia ingens E.May as well as of some functional derivatives of 1 are described.

Zur Chemie des Ingenols, I Ingenol und einige seiner Derivate/ On the Chemistry of Ingenol, I Ingenol and Some of its Derivatives