*4.2. General Procedure for Acetylation (GP 1)*

To a solution of the parent triterpenoic acid (1 equiv.) in dry DCM, acetic anhydride (3 equiv.), dry triethylamine (3 equiv.), and DMAP (catal. amounts) were added, and the mixture was stirred at 20 ◦C for one day. The usual aqueous work-up followed by re-crystallization from ethanol furnished the corresponding acetates 9–13. Their respective m.p., [*α*] 20 *<sup>D</sup>* values, 1H, and 13C NMR spectra, as well as ESI MS data, correspond to the literature values.

#### *4.3. General Procedure for the Synthesis of Amides 14–18 (GP 2)*

To a solution of acetates 9–13 (1 equiv.) in dry DCM (100 mL), oxalyl chloride (5 equiv.) and DMF (2 drops) were added and the mixture was stirred at 20 ◦C for 2 h. The volatiles were removed under diminished pressure and the residue was dissolved in dry DCM (100 mL). This solution was slowly added to a solution of the corresponding amine (3 equiv.) in dry acetonitrile (100 mL) in the presence of DMAP (catal. amounts). The mixture was stirred at 20 ◦C for 1 day, the volatiles were removed under diminished pressure, and the residue was subjected to column chromatography (silica gel) to afford products **14**–**18**.

#### *4.4. General Procedure for the Synthesis of the Rhodamine Conjugates 19–28 (GP 3)*

To a solution of the rhodamine (rhodamine B or rhodamine 101, 1 equiv.) in dry DCM (100 mL), oxalyl chloride (7 equiv.) and dry DMF (2 drops) were added, and the mixture was stirred at 20 ◦C for 1 h. The volatiles were removed under diminished pressure and the residue was dissolved in dry DCM (100 mL). A solution of the corresponding amine (1 equiv.) in dry DCM (100 mL) was added, followed by the addition of catal. amounts of triethylamine and DMAP. The mixture was stirred at 20 ◦C for 1 h (TLC showed completion of the reaction), the solvents were removed in vacuo, and the residue was subjected to column chromatography (silica gel, CHCl3/MeOH) to afford products **19**–**28**.
