1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphate + CTP + H(+) => 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-cytidine-5'-diphosphate + diphosphate
1-octadecanoyl-2-(9z-octadecenoyl)-sn-glycero-3-phosphate + ctp + h(+) => 1-octadecanoyl-2-(9z-octadecenoyl)-sn-glycero-3-cytidine-5'-diphosphate + diphosphate