Patent ID: 7335677

Claim:
A compound according to formula 1, or a pharmaceutically acceptable salt thereof, wherein: either G 1 is —CH 2 —X 2 —(CH 2 ) a -G 3 and G 2 is H, or G 2 is —CH 2 —(CH 2 ) a -G 3 and G 1 is H; G 3 is a group according to formula 4; a is 0, 1 or 2; b is 1; X 1 is CH 2 ; X 2 is CH 2 ; R 1 is H; R 15 and R 16 are independently selected from H, alkyl, alkenyl, aralkyl, aryl and —CH 2 -L-R 17 or R 15 and R 16 together form a group according to formula 5, formula 6 or formula 7; R 17 is selected from H, alkyl and aryl; R 18 is H; R 19 is H; L is selected from a covalent bond, CH═CH, C≡C and —C 6 H 4 —; d and e are selected from 0, 1, 2 and 3 such that d+e is 3, 4 or 5; and f is 2; provided that R 15 and R 16 are not both H.