Structure of New Bioactive Triterpenes Related to 22-β-Hydroxytingenone.-Nine new triterpenes of type (I), (II), and (III) are isolated from Maytenus amazonica along with ten known triterpenes. Their structure is elucidated by 1 H and 13 C spectroscopy. Some of the new compounds, e.g. (Ia), show weak cytotoxic activity. -(CHAVEZ, H.; VALDIVIA, E.; ESTEVEZ-BRAUN, A.; RAVELO, A. G.; Tetrahedron 54 (1998) 44, 13579-13590; Inst. Univ. Bio-Org., Univ. La Laguna, E-38206 La Laguna, Tenerife, Spain; EN)
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