label: 2 3-hexadecanoyl-sn-glycero-1-phospho-(1'-sn-glycerol) => 3-hexadecanoyl-sn-glycero-1-phospho-(3'-hexadecanoyl-1'-sn-glycerol) + sn-glycero-1-phospho-(1'-sn-glycerol)
label_lc: 2 3-hexadecanoyl-sn-glycero-1-phospho-(1'-sn-glycerol) => 3-hexadecanoyl-sn-glycero-1-phospho-(3'-hexadecanoyl-1'-sn-glycerol) + sn-glycero-1-phospho-(1'-sn-glycerol)