Nitrilotriacetic acid-containing lipidoid nanoparticles

A compound of formula (I):

• or a pharmaceutically acceptable salt thereof, wherein
• Y is a divalent linker;
• W is —NR20—, —O—, or —S—;
• RLipid is independently substituted or unsubstituted C1-20 alkyl, substituted or unsubstituted C1-20 alkenyl, substituted or unsubstituted C1-20 alknyl, substituted or unsubstituted C1-20 heteroalkyl, substituted or unsubstituted C1-20 heteroalkenyl, or substituted or unsubstituted C1-20 heteroalknyl;
• and
• R20 is RLipid, H, C1-6 alkyl, C1-6 alkenyl, or C1-6 alkynyl.