Lipidoid compounds and related compositions and uses

A compound of Formula (I):

• or a salt thereof,
• wherein:
• A is:
• each B is independently:
• in which * indicates attachment to A and ** indicates attachment to C;
• each C is independently:
• in which denotes a single or double bond;
• n is an integer between 2 to 6;
• a is an integer between 1 to 5;
• b is an integer between 1 to 5;
• each R1 is independently C1-C18 alkyl or C2-C18 alkenyl;
• each R2 is independently H or methyl;
• and
• each R3 is independently H or methyl.