| abstract |
wherein, “*” denotes the point of attachment to the remainder of the molecule, and R2, R2′, R2″, R3, R3′, R3″, R4, R4′, R4″, R5, R5′ and R5″ are independently selected from the group consisting of hydrogen, a linear or branched alkyl having 1 to 4 carbon atoms, trifluoromethyl, 2,2,2-trifluoroethyl, methylsulfanyl, ethylsulfanyl, methylsulfonyl, ethylsulfonyl, difluoromethoxy, trifluoromethoxy, fluoro, bromo, chloro, methoxy, ethoxy, propoxy, butoxy, hydroxy and amino. |