Patent ID: 8278323

Claim:
A compound of formula III: wherein: R 1 is —OH, —OR a , —CH 2 OH, —C(═O)OR 6 , —C(═O)NR 6 R 7 , or —NR 6 R 7 ; R 2 and R 3 are each independently alkyl or alkenyl; R 4 is H, alkyl, cycloalkyl, cycloalkylalkyl, aryl, heteroaryl, aralkyl, alkylaralkyl, or heteroarylalkyl; X is CH 2 ; R 6 is H, alkyl, cycloalkyl, alkylcycloalkyl, or aralkyl; R 7 is H, alkyl, aralkyl, or aryl; R a is a hydroxyl protecting group; m is 1; and n is 1 or a pharmaceutically acceptable salt thereof.