preferred_name: 6-(N-acetyl-alpha-D-glucosaminyl)-(1-octadecanoyl,2-(9Z)-octadecenoyl-sn-glycero-3-phospho)-1D-myo-inositol(in) <=> 6-(N-acetyl-alpha-D-glucosaminyl)-(1-octadecanoyl,2-(9Z)-octadecenoyl-sn-glycero-3-phospho)-1D-myo-inositol(out)