Patent ID: 7417068

Claim:
A compound of formula (I): or a salt, solvate and chemically protected form thereof, wherein: either R 2 is H or an optionally substituted C 1-4 alkyl group and R 5 is an optionally substituted C 5-7 aryl; or R 5 is H or an optionally substituted C 1-4 alkyl group and R 2 is an optionally substituted C 5-7 aryl; m and n can be 0 or 1, and m+n=1 or 2 R N is H or optionally substituted C 1-4 alkyl R 3 is either: a group of formula (II): or a group of formula (III): wherein R is optionally substituted C 1-7 alkyl, C 5-20 aryl, or NR N3 R N4 , where R N3 and R N4 are independently selected from optionally substituted C 1-4 alkyl.