Patent ID: 8536221

Claim:
A compound of formula (III): wherein R 1 is alkylcarbonyl, hydrogen, or methyl; R 2 is hydrogen or methyl; a is a single or double bond; X 1 is N or CH; X 2 is CH when a is a double bond, and X 2 is CH 2 or —CH 2 CH 2 — when a is a single bond; X 3 and X 4 are independently N or CH; T 1 and T 2 are independently hydrogen, alkyl, aryl, cycloalkyl, halo, haloalkyl, or R 3 -L 2 -, wherein at least one of T 1 and T 2 is other than hydrogen; L 2 is O or S; and R 3 is alkyl, aryl, cycloalkyl, or haloalkyl; or a pharmaceutically acceptable salt, ester, or amide thereof.