Four triterpenes, three lupanes, and a germanicane were isolated from Machaerocereus eruca. The germanicane derivative (1) was determined to be 3 beta,19 alpha-dihydroxygermanican-28-oic acid and named machaeroceric acid. The three new lupane derivatives were identified as 21-ketobetulinic acid (2), 16 beta-hydroxybetulinic acid (3), and 22 beta-hydroxystellatogenin (4), respectively, on the basis of their spectroscopic data.
Four triterpenes, three lupanes, and a germanicane were isolated from Machaerocereus eruca. The germanicane derivative (1) was determined to be 3 beta,19 alpha-dihydroxygermanican-28-oic acid and named machaeroceric acid. The three new lupane derivatives were identified as 21-ketobetulinic acid (2), 16 beta-hydroxybetulinic acid (3), and 22 beta-hydroxystellatogenin (4), respectively, on the basis of their spectroscopic data.
Glochodpurnoid B from Glochidion puberum Induces Endoplasmic Reticulum Stress-Mediated Apoptosis in Colorectal Cancer Cells
Glochidpurnoids A and B (1 and 2), two new coumaroyl or feruloyl oleananes, along with 17 known triterpenoids (3-19) were obtained from the stems and twigs of Glochidion puberum. Their structures were elucidated by extensive spectroscopic data analyses, chemical methods, and single crystal X-ray diffraction. All compounds were screened for cytotoxicity against the colorectal cancer cell line HCT-116