Patent ID: 8309545

Claim:
A compound represented by formula (Ia) or a salt thereof, wherein is an optional double bond; R 1 is chloro or hydrogen; R 2 is hydrogen; R 3 is methyl or methoxy; R 4 is selected from lower alkyl, lower alkoxy, C 2-6 alkenyl, C 2-6 alkenyloxy, C 2-6 alkynyl, or C 2-6 alkynyloxy, each substituted by optionally substituted aryl, optionally substituted aryloxy, optionally substituted heteroaryl, optionally substituted heteroaryloxy, optionally substituted heterocyclyl, optionally substituted heterocyclyloxy, or NR′R″ (where R′ and R″ are independently selected from hydrogen and lower alkyl); L is a divalent linker group of 1-6 atoms in length selected from optionally substituted alkylene, optionally substituted alkenylene, optionally substituted alkynylene; and R 6 is selected from halo, CN, optionally substituted C 3-7 cycloalkyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted heterocyclyl, —C(O)-heterocyclyl, —C(O)NR′″R′″, —NR′″R′″, —OR′″, —S(O)R′″, —S(O) 2 R′″, —Se(O)R′″, and —Se(O) 2 R′″ (where each R′″ is independently selected from hydrogen, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted C 3-7 cycloalkyl, optionally substituted heterocyclyl, optionally substituted heteroaryl, and optionally substituted aryl).