label: 1-O-hexadecyl-sn-glycero-3-phosphocholine + N-(acetyl)-sphing-4-enine + H(+) => 1-O-hexadecyl-2-acetyl-sn-glycero-3-phosphocholine + sphing-4-enine
label_lc: 1-o-hexadecyl-sn-glycero-3-phosphocholine + n-(acetyl)-sphing-4-enine + h(+) => 1-o-hexadecyl-2-acetyl-sn-glycero-3-phosphocholine + sphing-4-enine