Patent ID: 8637490

Claim:
A compound of formula (I): wherein: each R 1 is independently —B(XR′) 2 , wherein each X is independently selected from O and S, and each R′ is independently selected from hydrogen and alkyl, or two R′ are taken together to form an optionally substituted 5- to 8-membered ring; each R 2 is independently selected from optionally substituted alkyl, alkoxy, amino, halo, and —CH 2 —N(R a ) 3 ⊕; each R 3 is independently selected from: each R 4a and R 4b is independently selected from halo and —OSO 2 R a ; each Y is independently a bond or —CH 2 —; each R 5 is independently C 1 -C 4 alkyl; n is 0, 1 or 2; p is 1 or 2; each R a is independently selected from optionally substituted alkyl; wherein if the compound of formula (I) bears a positive charge, it further comprises at least one counterion Z⊖.