label: sphing-4-enine + (5Z,8Z,11Z,14Z)-eicosatetraenoate => N-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-sphing-4-enine + H2O
label_lc: sphing-4-enine + (5z,8z,11z,14z)-eicosatetraenoate => n-(5z,8z,11z,14z-eicosatetraenoyl)-sphing-4-enine + h2o