Patent ID: 7138547

Claim:
A compound of formula: wherein: the terminal group —C(X) 3 is CH 3 ; Y is OR 1 , wherein R 1 is selected from H, C(═O)R′, P(═O)R′R″, S(═O)R′R″, substituted or unsubstituted C 1 –C 18 alkyl, substituted or unsubstituted C 2 –C 18 alkenyl, substituted or unsubstituted C 2 –C 18 alkynyl, or substituted or unsubstituted aryl and wherein the dotted line indicates an optional double bond such that Y can also be ═O; or the group Y with NR 2 R 3 and the intervening atoms can form a heterocycle; the terminal group —C(Z) 3 is CH 3 ; z is 11 to 19; y is 1 to 3, wherein when y is 2, then z is not 14; R 2 and R 3 are the same or different and each is H, C(═O)R′, C(═S)R′, P(═O)R′R″, S(═O)R′R″, S(═O) 2 R′, substituted or unsubstituted C 1 –C 18 alkyl, substituted or unsubstituted C 2 –C 18 alkenyl, substituted or unsubstituted C 2 –C 18 alkynyl, substituted or unsubstituted aryl; each of the R′, R″ groups is independently selected from the group consisting of H, OH, NO 2 , NH 2 , NHR′, NR′R″, SH, CN, halogen, ═O, C(═O)H, C(═O)CH 3 , CO 2 H, CO 2 CH 3 , substituted or unsubstituted C 1 –C 18 alkyl, substituted or unsubstituted C 1 –C 18 alkoxy, substituted or unsubstituted C 2 –C 18 alkenyl, substituted or unsubstituted C 2 –C 18 alkynyl, substituted or unsubstituted aryl; and salts thereof.