The taspine is a secotetrahidroiso alkaloid isolated from plants quinolinic Leontice eversmannii, (Leonticaceae) Caulophyllum robustum , liliflora Magnolia bark and Croton lechleri. As for its chemical composition, in the cortex (latex) are scientists have found: steroids, coumarins , alkaloids ( taspine) , flavonoids , tannins (54%), saponins (low concentration), anthocyanins , phenolic compounds (gallic acid) ; also it contains vitamin A, E and C, starch, cellulose, fats, lignans ( mucilages , proteins, catechins (epicatechin, gallocatequina , epigallocatechin ), etc. All this means that there are two species used in traditional medicine are the Croton lechleri Muell . Arg and Croton draconoides var . Cordatus Muell . Arg . They have very similar chemical and therapeutic properties. It has anti-inflammatory activity. The candidate taspine is as estrogen receptor antagonist in the treatment of breast cancer estrogen independent