Compounds of formula (I), including pharmaceutically acceptable salts thereof, are set forth herein: wherein R1, R2, R3, R4, R5, and R6 are independently hydrogen, C1-C6 alkyl or C1-C6 cycloalkyl; Y and Z are independently a C6-C10-aryl group or a 5-10 membered heterocyclic group, wherein each Y and Z group can be optionally substituted with from 0-3 substituents selected from halogen, amino, C1-4alkylamino, C1-4dialkylamino, haloC1-4 alkyl, OH, CN, C1-C6 alkyl or cycloalkyl, C1-C6 alkoxy, and C2-C4 alkynyl; L is either a bond or is —NHCO—; L and Z together can be absent; and m is 1, 2 or 3.