Patent ID: 7579366

Claim:
A compound represented by the following structure: wherein the waved bond indicates that bond “a” is present either in the cis or in the trans form; (i) R 3 is a radical selected from the group consisting of hydrogen; lower alkyl (C 1 -C 6 ); —CH═CH 2 ; —C≡CH; —CH 2 F; —CH 2 Cl; —CH 2 —OH; —CH 2 —O—(C 1 -C 6 alkyl); and —CH 2 —S—(C 1 -C 6 alkyl); R 4 and R 5 are independently selected from the group consisting of hydrogen, methyl, and a hydroxyl protecting group; and R 1 is a radical selected from the following structures: (ii) and, if R 3 is —CH═CH 2 ; C≡CH; —CH 2 F; —CH 2 Cl; —CH 2 —OH; —CH 2 —O—(C 1 -C 6 alkyl); and —CH 2 —S—(C 1 -C 6 alkyl); and the other symbols except R 1 have the same meanings given above, R 1 can also be a radical selected from the following structures: (iii)and, if R 3 is —CH═CH 2 ; C≡CH; —CH 2 F; —CH 2 Cl; —CH 2 —OH; —CH 2 —O—(C 1 -C 6 alkyl); and —CH 2 —S—(C 1 -C 6 alkyl); and the other symbols except R 1 have the same meanings given above under (i), R 1 can also be a moiety of the formula or a salt thereof where one or more salt-forming groups are present.