Patent ID: 7754739

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof, wherein independently for each occurrence: m is 0-4; R M is Z M R 11 , wherein each Z M is a bond or an optionally substituted branched or straight C 1-6 aliphatic chain wherein up to two carbon units of Z M are optionally replaced by —CO—, —CS—, —CONR N —, —CO 2 —, —OCO—, —NR N CO 2 —, —O—, —OCONR N —, —NR N CO—, —S—, —SO—, —SO 2 —, or —NR N —; R 11 is R N , halo, —OH, —NH 2 , —NO 2 , —CN, —CF 3 , or —OCF 3 ; R N is H or an optionally substituted C1-C8 aliphatic; R 1 is a C1-C6 aliphatic; R 2 is H or an optionally substituted C1-C6 aliphatic; R 3 and R′ 3 together with the carbon atom to which they are attached form an unsubstituted C 3-7 cycloalkyl ring; and R4 is: