Patent ID: 8637556

Claim:
A compound represented by the formula wherein A is one of wherein R 1 is O or S and R 2 is halo or ethyl, (ii) L is selected from —(CH 2 ) n — wherein n is an integer from 1 to 10; —[C(O)—NH] m —[(CH 2 ) n —NH—C(O)]—, wherein m is an integer from 0 to 1, n is an integer from 1 to 10, and p is an integer from 1 to 3; or —[(CH 2 ) m —Ar n ] p —, wherein Ar is an aryl group, m is from 1 to 10, n is from 1 to 5, and p is from 1 to 5; and (iii) B is or a pharmaceutically acceptable salt thereof.