1-hexadecanoyl-2-(9Z,12Z-octadecadienoyl)-sn-glycero-3-phospho-(1'-sn-glycerol) + 1-hexadecanoyl-sn-glycero-3-phosphocholine = 1-hexadecanoyl-sn-glycero-3-phospho-(1'-sn-glycerol) + 1-hexadecanoyl-2-(9Z,12Z-octadecadienoyl)-sn-glycero-3-phosphocholine