http://www.w3.org/ns/prov#value | - A composition comprising (i) a lipid compound comprising at least one non-polar moiety and a polar moiety, wherein the non-polar moiety is of the formula X-Y-Z- wherein X is an acetylenic hydrocarbyl group containing a single C???C bond, Y is O or CH2, and Z is an optional hydrocarbyl group, wherein the polar moiety is of the formula -[T]mPHG, wherein [T]m is an optional group selected from C(O),
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