Patent ID: 7045546

Claim:
A compound of the formula (I): where R 1 is a C 2 –C 22 saturated or unsaturated fatty acid residue, an amino acid residue, or a C 1 –C 17 alkyl; R 2 is a group of the following formula (II): wherein R 5 and R 6 are the same or different and represent hydrogen or a C 1 –C 4 alkyl, or R 5 is a C 1 –C 4 alkyl group and R 6 is a metal cation or ammonium cation, or R 6 is a C 1 –C 4 alkyl group and R 5 is a metal cation or ammonium cation, or both R 5 and R 6 are a metal cation or ammonium cation; and R 3 and R 4 are the same or different and represent hydrogen, a C 2 –C 22 saturated or unsaturated fatty acid residue, an amino acid residue, or a C 1 –C 17 alkyl.