preferred_name: N-acetyl-beta-D-glucosaminyl-(1->4)-1,6-anhydro-N-acetyl-beta-D-muramoyl-L-alanyl-gamma-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanyl-D-alanine(out) + n H(+)(out) => N-acetyl-beta-D-glucosaminyl-(1->4)-1,6-anhydro-N-acetyl-beta-D-muramoyl-L-alanyl-gamma-D-glutamyl-meso-2,6-diaminopimeloyl-D-alanyl-D-alanine(in) + n H(+)(in)