Patent ID: 7993628

Claim:
A compound represented by the following general formula (I), or a salt thereof: wherein R 1 , R 2 and R 3 independently represent an alkyl group having 8 to 30 carbon atoms, which may have a substituent, or an alkenyl group having 8 to 30 carbon atoms, which may have a substituent; X 1 and X 2 independently represent a single bond, —O—, or —N(Z 1 )- (Z 1 represents hydrogen atom, or an alkyl group having 1 to 3 carbon atoms), provided that X 1 and X 2 do not simultaneously represent a single bond; X 3 , X 4 , X 5 and X 6 independently represent —O—, or —N(Z 2 )- (Z 2 represents hydrogen atom, or an alkyl group having 1 to 3 carbon atoms); n represents an integer of 1 to 10; and L represents a divalent bridging group (L is constituted by atoms selected from the group consisting of carbon atom, hydrogen atom, oxygen atom, nitrogen atom, fluorine atom and sulfur atom, wherein the total number of oxygen atom constituting L is 0 to 9, that of nitrogen atom is 0 to 4, that of fluorine atom is 0 to 8, and that of sulfur atom is 0 to 2, and the total number of carbon atom, oxygen atom, nitrogen atom and sulfur atom constituting L is 1 to 20).