... UV absorbing fractions (TLC) were collected and evaporated to dryness. The residue was dissolved in H2O (50 ml) and 5 ml volume portions were injected to the column. ... Chim. Acta 74, 1742 (1991) ORIGINAL ARTICLES 124 Pharmazie 58 (2003) 2 Scheme N N N N R Cl ...