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What does D-GPC stand for?

D-GPC stands for 1,2-diacyl-sn-glycero-3-phosphocholine

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LIPID MAPS classification hierarchy Category (Example: Prenol lipids [LMPR]) Main class (Example: Isoprenoids [LMPR01]) Sub class (where applicable) (Example: C15 Isoprenoids (sesquiterpenes) [LMPR0103]) Level 4 class (where applicable) (Example: Bisabolane sesquiterpenoids [LMPR010306]) The LIPID MAPS LM_ID identifier The LIPID MAPS ID (LM_ID) is a unique identifier based on the classification scheme described above. The format of the LM_ID, outlined in the table below, provides a systematic means of assigning unique IDs to lipid molecules and allows for the addition of large numbers of new categories, classes and subclasses in the future. Currently, most LM_ID's have 12 characters, the exceptions being the molecules belonging to the level-4 classes of prenol lipids which have LM_ID's of 14 characters. The last four characters of the LM_ID comprise a unique identifier within a particular subset and are randomly assigned. In the case of generic structures containing "R" groups (such as 1,2-diacyl-sn-glycero-3-phosphocholine.
1,2-diacyl-sn-glycero-3-phosphocholine (PC) (fig. 1) consists of polar head group phosphorylcholine attached to the sn-3 position of glycerol and differing saturated and unsaturated fatty acids esterified to the sn-1 and sn-2 position, whereby, the fatty acid in position sn-1 are preferentially saturated as a rule[6]. Different fatty acids attached to glycerol moiety makes PC a very complex molecule and consequently pose difficulty in analyzing PC with its exact fatty acid composition.