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The phospholipic compound that exists in anionic form is phosphatidic acid. The hydrolysis of this acid results in the formation of fatty acids, glycerol, and phosphoric acid.

The compound contains phosphoric acid and ester groups. The structure is given below.

Structure of phosphatidic acid

The priorities for the atoms in phosphatidic acid are given according to the atomic numbers of the atoms directly connected to the asymmetric carbon. If the atoms are connected in a bulk, then we can consider the whole bulk group.

Thus, the identities of ${\text{R}}^1$and ${\text{R}}^2$in phosphatidic acid do not affect the configuration of the asymmetric center. It is illustrated below.

Phosphatidic acid