Peptoid oligomers, pharmaceutical compositions and methods of using the same

A peptoid oligomer according to formula lb:

• wherein
• each R1 is independently R1a, R1b, or R1c;
• each R2 is independently hydrogen, or substituted or unsubstituted alkyl;
• or each R1 and R2 are joined together to form a 4-7 membered heterocyclic ring;
• each R1a is independently unsubstituted alkyl, or alkyl substituted with halo, hydroxy, amino, nitro, or alkoxy;
• each R1b is independently aminoalkyl, guanidinoalkyl (H2N—C(═NH)—NH-alkyl), or N-containing heteroarylalkyl, and each R1b is unsubstituted or substituted with one or more F;
• each R1c is independently substituted or unsubstituted aryl, substituted or unsubstituted aralkyl, substituted or unsubstituted heteroarylalkyl, or substituted or unsubstituted diarylalkyl;
• and n is an integer between 4 and 20;
• provided that at least one of R1s is R1b;
• a pharmaceutically acceptable salt, a stereoisomer, an isotopic variant, or a tautomer thereof.