Hydrogen sulfide derivatives of non-steroidal anti-inflammatory drugs

1. A compound of the formula:

B—C(O)O—X  (Formula II)

wherein B—C(O)O— is derived from an NSAID having a free carboxyl group, wherein the NSAID is selected from the group consisting of acetylsalicylic acid, diclofenac, indomethacin, lumiracoxib, naproxen, ibuprofen, ketoprofen and flurbiprofen;

and X is

or a salt thereof.

2. A compound of the formula:

or a pharmaceutically acceptable salt thereof.

3. A compound of the formula:

or a pharmaceutically acceptable salt thereof.

4. A compound of the formula:

or a pharmaceutically acceptable salt thereof.

5. A compound of the formula:

or a pharmaceutically acceptable salt thereof.

6. A compound of the formula:

or a pharmaceutically acceptable salt thereof.

7. A compound of the formula:

or a pharmaceutically acceptable salt thereof.