Rules for the annotation

Shorthand notation: Lipid class abbreviation followed by number of C-atoms:number of double bonds.
Fatty acids linked to the glycerol are known:
- separator _: sn-position of the fatty acids is not known
- separator /: sn-position of fatty acids is proven (order sn-1/sn-2/sn-3 for GL; sn-1/sn-2 or sn-2/sn-3 for GP); no FA linked 0:0
Other bond types than ester bonds are indicated as follows in front of the sum of C-atoms or fatty acid:
- O = proven O-alkyl-bond (it is important to note that “O” after the number of carbons designates a keto bond)
- P = proven O-alk-1-enyl-bond (acid-sensitive ether bond in “plasmalogens”).
More than one "non"-ester bond is indicated in front of the bond type as d for di, t for tri.

Lipid class abbreviations

Bond type	Lipid class level mass$	Lipid species level§	Bond type level	Fatty acyl/alkyl level	Fatty acyl/alkyl position level	LIPID MAPS Fatty acyl/alkyl structure level
Acyl	MG (358)	MG 18:0	MG 18:0	MG 18:0	MG 0:0/18:0/0:0
Alkyl	MG (344)	MG O-18:0	MG O-18:0	MG O-18:0	MG 0:0/O-18:0/0:0
Diacyl	DG (594)	DG 34:1	DG 34:1	DG 16:0_18:1	DG 16:0/18:1/0:0	DG 16:0/18:1(9Z)/0:0
Alkyl-acyl	DG (580)	DG O-34:1	DG O-34:1	DG O-16:0_18:1	DG O-16:0/18:1/0:0	DG O-16:0/18:1(9Z)/0:0
Dialkyl	DG (538)	DG 30:1	DG dO-32:1	DG O-16:0_O-16:1	DG O-16:0/O-16:1/0:0	DG O-16:0/O-16:1(9Z)/0:0
Dialkyl	TG (858)	TG 52:2	TG 52:2	TG 16:0_18:1_18:1	TG 16:0/18:1/18:1	TG 16:0/18:1(9Z)/18:1(11Z)
Alkyl-diacyl	TG (844)	TG O-52:2	TG O-52:2	TG O-16:0_18:1_18:1	TG O-16:0/18:1/18:1	TG O-16:0/18:1(9Z)/18:1(11Z)
Dialkyl-acyl	TG (830)	TG 50:2	TG dO-52:2	TG O-18:1_O-16:0_18:1	TG O-18:1/O-16:0/18:1	TG O-18:1(9Z)/O-16:0/18:1(9Z)
Trialkyl	TG (816)	TG O-50:2	TG tO-52:2	TG O-18:1_O-16:0_O-18:1	TG O-18:1/O-16:0/O-18:1	TG O-18:1(9Z)/O-16:0/O-18:1(9Z)

$ m is the uncharged molecular mass
§ Annotation based on assumption of even numbered carbon chains only