1-octadecanoyl-sn-glycero-3-phosphocholine + acetyl-CoA = 1-octadecanoyl-2-acetyl-sn-glycero-3-phosphocholine + CoA
1-octadecanoyl-sn-glycero-3-phosphocholine + acetyl-coa = 1-octadecanoyl-2-acetyl-sn-glycero-3-phosphocholine + coa