Hedgehog pathway antagonists disubstituted phthalazine

A compound of the formula ** ** Formula wherein: R1 is hydrogen or methyl; R2 is hydrogen or methyl; and R3, R4, R5, R6 and R7 are each independently hydrogen, fluoro, chloro, cyano, trifluoromethyl, trifluoromethoxy, difluoromethoxy, methylsulfonyl or trifluoromethylsulfonyl, provided deque at least three of R3, R4, R5, R6 and R7 are hydrogen; or a pharmaceutically acceptable salt thereof.