Patent ID: 7723326

Claim:
A compound of Formula I wherein R 1 is H or C 1-3 alkyl; W is V is —O—, wherein R 2 and R 3 can be the same or different, each being independently selected from H and optionally substituted C 1-3 alkyl; R 4 is independently wherein Z is selected from X is selected from a bond, optionally substituted —O—C 1-5 alkyl, and optionally substituted C 1-6 alkylene; R a is optionally substituted C 1-3 alkoxy; and n is 0, 1, 2, or 3; or alternatively R 4 is H or optionally substituted C 1-3 alkyl; with the proviso that when R 4 is then R 5 cannot be provided further that when R 4 is H or optionally substituted C 1-3 alkyl, then R 5 cannot be H or optionally substituted C 1-3 alkyl; and R 5 is independently wherein Z is selected from X is selected from a bond, optionally substituted —O—C 1-5 alkyl-, and optionally substituted C 1-6 alkylene; R a is optionally substituted C 1-3 alkoxy; and n is 0, 1, 2, or 3; or alternatively R 5 is H or optionally substituted C 1-3 alkyl; with the proviso that when R 5 is then R 4 cannot be provided further that when R 5 is H or optionally substituted C 1-3 alkyl, then R 4 cannot be H or optionally substituted C 1-3 alkyl; or pharmaceutically acceptable salts thereof.