Patent ID: 8143284

Claim:
A compound having formula (I) or a salt thereof, wherein A 1 is C(O)NH 2 ; A 2 , A 3 and A 4 are hydrogen; R 1 is alkyl, alkenyl or alkynyl, each of which is unsubstituted or substituted with one or two of three of independently selected CF 3 , CF 2 CF 3 , F, Cl, Br or I; A 5 is R 2 ; R 2 is phenyl; wherein R 2 is substituted with R 10 ; R 10 is R 13 ; R 13 is C 4 -cycloalkyl, piperidinyl or piperazinyl; and R 13 is unsubstituted or substituted with alkyl.