(3R,4S)-2,2-Difluoro-3-hydroxy-6-methyl-4-[(S)-6-(3-methyl-thioureido)-2-(3-naphthalen-1-yl-2-naphthalen-1-ylmethyl-propionylamino)-hexanoylamino]-heptanoic acid (2-morpholin-4-yl-ethyl)-amide