label: a 1-acyl-sn-glycero-3-phosphoethanolamine => a 1-acyl-sn-glycero-2,3-cyclic phosphate + ethanolamine
label_lc: a 1-acyl-sn-glycero-3-phosphoethanolamine => a 1-acyl-sn-glycero-2,3-cyclic phosphate + ethanolamine