中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2,3,4,6,7-pentamethoxy-9,10-dihydrophenanthrene | 35323-53-6 | C19H22O5 | 330.381 |
—— | 2,7-diacetoxy-3,4,6-trimethoxy-9,10-dihydrophenanthrene | 39499-94-0 | C21H22O7 | 386.401 |
—— | 2,2',7,7'-tetrahydroxy-3,3',4,4',6,6'-hexamethoxy-9,9',10,10'-tetrahydro-1,1'-biphenanthryl | 1030297-32-5 | C34H34O10 | 602.638 |
Combretum caffrum, a tree in the family Combretaceae, has been found to contain three 9,10-dihydrophenanthrenes (6,7-dihydroxy-2,3,4-trimethoxy; 7-hydroxy-2,3,4,6-tetramethoxy; and 2,7-dihydroxy-3,4,6-trimethoxy) that inhibit (ED50 2.2, 2.8, and 2.6 μg/mL) growth of the murine lymphocytic leukemia cell line. One phenanthrene (7-hydroxy-2,3,4,6-tetramethoxy) was also isolated with similar (ED50 2.0 μg/mL) activity. Structures for each of these substances, including a dihydrophenanthrene (2-hydroxy-3,4,6,7-tetramethoxy-9,10-dihydrophenanthrene), were determined by detailed high resolution nuclear magnetic resonance and mass spectral studies and (or) X-ray crystal structure analysis.