Patent ID: 8349834

Claim:
A compound having the following formula (I): wherein: R 1 is R 4 is H or R 5 C(O), R 5 CH 2 OC(O) or R 5 CH 2 NHC(O) where R 5 is a C 7-23 alkenyl of the general formula CH 3 —(CH 2 ) n —(CH═CH—CH 2 ) m —CH═CH—(CH 2 ) 4 (II) wherein m is a number from 0 to 2 and n is a number from 0 to 10; and R 2 is H or R 5 C(O), R 5 CH 2 OC(O) or R 5 CH 2 NHC(O) where R 5 is a C 7-23 alkenyl of the general formula CH 3 —(CH 2 ) n —(CH═CH—CH 2 ) m —CH═CH—(CH 2 ) 4 — (II) wherein m is a number from 0 to 2 and n is a number from 0 to 10, with the proviso that R 2 and R 4 cannot simultaneously be hydrogen, or a pharmaceutically acceptable salt thereof.