Patent ID: 8853222

Claim:
A compound of the formula 1. wherein A is CH 2 [or O]; B is H, Cl, alkoxy of 1-6 carbon atoms, phenoxy, phenylalkoxy where alkoxy is 1-6 carbon atoms, NH 2 , OH or SH; R 1 is 2. wherein n is 1 and R 3 is H or alkyl of 1-4 carbon atoms; and R 2 is independently H, C(O)R 5 where R 5 is alkyl of 1-5 carbon atoms, C(O)CH(NH 2 )R 4 where R 4 is H or alkyl of 1-4 carbon atoms, proline, hydroxyproline, or 3. wherein n and R 3 are as defined above, or a pharmaceutically acceptable salt thereof.