label: an N-acylsphing-4-enine + a 1,2-diacyl-sn-glycero-3-phosphocholine <=> a sphingomyelin + a 1,2-diacyl-sn-glycerol
label_lc: an n-acylsphing-4-enine + a 1,2-diacyl-sn-glycero-3-phosphocholine <=> a sphingomyelin + a 1,2-diacyl-sn-glycerol