A mixture of 3-oxo-N-[4-[4-(-3oxobutanoylamino) phenoxy]phenyl]butanamide (300 mg, 0.814 mmol), thiourea (185 mg, 2.44 mmol), benzaldehyde (0.25 mL, 2.44 mmol) and catalytic amoun of conc. HCl (4 drops) in EtOH (10 mL) was refluxed overnight. After the completion of reaction, the reaction mixture was allowed to cool. The solid product formed was filtered, washed with water (5 mL) and cold ether (3x5 mL) to remove the unreacted thiourea or benzaldehyde or 3-oxo-N-[4-[4-(-3oxobutanoylamino) phenoxy]phenyl]butanamide and dried. The title compound was obtained as a light yellow solid (486 mg, 94% yield).

Methanesulfonyl chloride (0.32 ml, 4.12 mmol) and TEA (0.57 ml, 4.12 mmol) were added to a solution of (R)-2-(2-hydroxy-1-phenylethyl)isoindoline-1,3-dione (1.0 g, 3.7 mmol) in DCM (20 ml) and were stirred overnight. The resulting solution was washed with water (3 × 20 ml) and dried over anhydrous sodium sulphate. The solvents were removed under reduced pressure and the residue was used in the subsequent reaction without further purification. Yield 1.22 g (94%).

To a stirring solution of dodecane-1-thiol (1.74 g, 86 mmol) in a mixture of acetonitrile and water (4 : 1 vol., 40 mL) on an ice-bath was added portion-wise trichloroisocyanuric acid (2.90 g, 125 mmol) at such a rate to maintain the temperature at no more than 5 °C. The mixture was left stirring for 30 min in the ice-bath. The precipitated cyanuric acid was then removed by filtration and washed with ethyl acetate (30 mL). The combined filtrate was evaporated under reduced pressure at the bath temperature not higher than 30 °C (to minimize the losses from hydrolysis). The so obtained crude product was dissolved in petroleum ether (50 mL), washed with cold 1% HCl(aq) (50 mL), dried over Na₂SO₄ and again evaporated under reduced pressure to give the product as a white powder (1.40 g, 61%).