Patent ID: 7727558

Claim:
A polymeric delivery agent having the formula: or a salt thereof, wherein R 16 is —R 3 -R 4 ; R 3 —NHC(O)NH—, —C(O)NH—, —NHC(O)—, —OOC—, —COO—, —NHC(O)O—, —OC(O)NH—, —CH 2 NH—, —NHCH 2 —, —CH 2 NHC(O)O—, —OC(O)NHCH 2 —, —CH 2 NHCOCH 2 O—, —OCH 2 C(O)NHCH 2 —, —NHC(O)CH 2 O—, —OCH 2 C(O)NH—, —NH—, —O—, or carbon-carbon bond; R 4 the formula R 5 , R 6 , R 7 , R 8 , and R 9 are independently a bond to R 3 , or H, Cl, Br, F, —OH, —CH 3 , —OCH 3 , or —(CH 2 ) m CH 3 ; R 10 is a bond to R 3 —COOH, or —C(O)NH—R 11 -R 12 ; R 11 is a substituted or unsubstituted, linear or branched alkylene having a chain length of from about 1 to about 11 or —R 13 -R 14 —; R 12 is a bond to R 3 is —COOH, —NH 2 , —OH, —C(O)—R 15 , —COO—R 15 , —NHR 15 , —OR 15 , Cl, or Br; R 13 is a substituted or unsubstituted phenylene; R 14 is a substituted or unsubstituted, linear or branched alkylene having a chain length of from about 1 to about 5; R 15 is a bond to R 3 ; m is from about 1 to about 4; R 17 —OH or —OCH 3 ; R 23 is H or —CH 3 ; and n is from about 3 to about 200.