Cyclodextrin dimers and their uses thereof as chemical scavengers

A compound having the following formula (I):

• wherein
• either R1 is a group of the formula —Y-Nu and R2 is H;
• or R1 is H and R2 is a group of the formula —Y-Nu;
• Y is a linker selected from the group consisting of the following groups:
• —O—(CH2)m—, wherein m is 1, 2, or 3;
• —(CH2)p—NH—C(═O)—(CH2)q—, wherein p is 0 or 1, and q is 0, 1, or 2;
• —CONH—(CH2)r—, wherein r is 1, 2, or 3;
• —O—(CH2)s—C≡C—(CH2)t—, wherein s is 1, 2, 3, 4, 5, or 6, and t is 0, 1, 2, or 3;
• Nu is selected from the following formulas:
• formula (II)
• wherein
• either R is COOH, and X is C—I═O, or formula (I-a):
• or R is CH═N—OH, and X is N or N+—(C1-C6)alkyl,
• or R is CO—NH—OH, and X is N.