6-[6-(2-aminoethylphosphoryl)-alpha-mannosyl-(1-6)-2-(2-aminoethylphosphoryl)-alpha-mannosyl-(1-6)-alpha-2-(2-aminoethylphosphoryl)mannosyl-(1-4)-alpha-glucosaminyl]-O-acyl-1-phosphatidyl-1D-myo-inositol