Patent ID: 6995187

Claim:
A compound of the formula: and physiologically acceptable salts thereof, wherein R 1 is selected from H; OH; OCH 3 ; N 3 ; and NH 2 ; R 2 is selected from (CH 2 ) n CH 3 , where n is an integer from 4–6; C(CH 3 ) 2 (CH 2 ) n CH 3 , where n is an integer from 3–5; (CH 2 ) n C≡CH where n is an integer from 3–5; and C≡C(CH 2 ) n CH 3 where n is an integer from 2–4; and R 3 is selected from H; CH 3 ; C 2 H 5 ; C 3 H 7 ; and C 4 H 9 .