label: a sterol + a 1,2-diacyl-sn-glycero-3-phosphocholine => a sterol ester + a 1-acyl-sn-glycero-3-phosphocholine
label_lc: a sterol + a 1,2-diacyl-sn-glycero-3-phosphocholine => a sterol ester + a 1-acyl-sn-glycero-3-phosphocholine