Patent ID: 8853424

Claim:
A compound of formula (8′) R 3 ′—B(ZR 1 ′)—X′—B(ZR 2 ′)—R 4 ′ (8′) wherein B is a boron atom, Z is O, R 1 ′ and R 2 ′ are H, —(CH 2 ) m —NH 2 , —CH 2 R 12 ′ wherein R 12′ is pyrrolidinyl, —COCH(NH 2 )—(CH 2 ) m NHCONH 2 , or —COCH(NH 2 )—(CH 2 ) m —CONH 2 , and m is an integer of 1 to 5, R 3 ′ and R 4 ′ are phenyl or thienyl, and X′ is a 2,8-dibenzothiophenyl group, or a pharmaceutically acceptable salt thereof.