EP2010538B1 - PROCESS for the PREPARATION of Ý(1r), 2s¨-2-AMINOPROPIONIC ACID 2-Ý4-(4-FLUORO-2-METHYL-1h-INDOL-5-YLOXY)-5-METHYLPYRROLOÝ2,1-f¨Ý1,2,4¨TRIAZIN-6-YLOXY¨-1-METHYLETHYL ESTER