Patent ID: 8227383

Claim:
A compound having the formula: wherein Ar is a substituted or unsubstituted arylalkyl group; p is 1 or 2; m and n are independently 0, 1, 2, 3, 4, or 5; each G 1 is C(O)O or OC(O) and each G 2 is absent; each R 2 is independently H or a lower alkyl; each G 3 is (CH 2 ) q ; q is 1, 2, 3, 4 or 5; R is a hydrophilic group; R 1 is a saturated or unsaturated hydrophobic aliphatic group selected from the group consisting of C 5 to C 18 alkyl, C 5 to C 18 alkenyl and C 5 to C 18 alkadienyl; wherein when p is 1, Ar is substituted by OH, SH or NH 2 ; and wherein when at least one G 2 is absent, G 1 is other than O.