Compounds and compositions for delivering active agents

A compound of the formula

• 5
• wherein:
• R1, R2, R3, R4, and R5 are independently selected from hydrogen, halogen, —OH, —OCH3, C1-C4 alkyl, —NH2, —NH(CH3), —N(CH3)2, or —NO2;
• m is an integer ranging from 0 to 4;
• R6 is a phenyl substituted with —O—R7−COOH at the ortho, meta, or para position;
• R6 is optionally substituted with one or more members selected from halogen, —OH, —OCH3, C1-C4 alkyl, —NH2, NH(CH3), —N(CH3)2, and —NO2;
• and
• R7 is C1-C12 alkyl,
• or a salt thereof.