| seco-iridoids from calycophyllum spruceanum (rubiaceae). | three seco-iridoids 7-methoxydiderroside, 6'-o-acetyldiderroside and 8-o-tigloyldiderroside, were isolated from the wood bark of calycophyllum spruceanum together with the known iridoids loganetin, loganin and the seco-iridoids secoxyloganin, kingiside and diderroside. their structures were elucidated by means of nmr and ms spectral data analysis. using noe correlations and coupling constants, the relative stereochemistry of the new derivatives was established. 7-methoxydiderroside, 6'-o-acetyld ... | 2003 | 12943773 |