an N-acyl-15-methylhexadecasphing-4-enine + phosphocholine + H(+) => an N-acyl-15-methylhexadecasphing-4-enine-1-phosphocholine + H2O
an n-acyl-15-methylhexadecasphing-4-enine + phosphocholine + h(+) => an n-acyl-15-methylhexadecasphing-4-enine-1-phosphocholine + h2o