Potential antitumor agents. Part 38. 3-Substituted 5-carboxamido derivatives of amsacrine
摘要:
The synthesis and biological evaluation of a series of 3-substituted 5-carboxamido derivatives of amsacrine (m-AMSA) are described. This series was developed as the result of previous quantitative structure-activity relationship (QSAR) studies of the antitumor activity of 9-anilinoacridine derivatives. In agreement with these studies, this class of compounds, possessing a variety of small nonpolar groups at the 3-position, together with very hydrophilic carboxamido groups at the 5-position, have high in vivo activity against animal leukemia models.
Studies on Mexican Cactaceae. II. Opuntia megarrhiza, a poorly known endemic from San Luis Potosí, Mexico
摘要:
Opuntia megarrhiza Rose (Cactaceae) is a species endemic to central San Luis Potosi,, Mexico that, since originally described in 1906, has remained poorly understood. A comprehensive morphological description is presented and its presumed taxonomic affinity with O. chaffeyi is discussed. General accounts of its distribution, ecology, uses, and conservation status are presented.