label: 1-hexadecanoyl-2-nonadioyl-sn-glycero-3-phosphocholine + N-(acetyl)-sphing-4-enine => 2-nonadioyl-sn-glycero-3-phosphocholine + 1-hexadecanoyl-N-(acetyl)-sphing-4-enine
label_lc: 1-hexadecanoyl-2-nonadioyl-sn-glycero-3-phosphocholine + n-(acetyl)-sphing-4-enine => 2-nonadioyl-sn-glycero-3-phosphocholine + 1-hexadecanoyl-n-(acetyl)-sphing-4-enine