In another embodiment of this invention the compounds of formula are selected from the group consisting of the final compounds of {HEAD ~ Examples} 2, 4, 5, 6, 8, 9, 10, 11, and 14, and the free base form of the final compounds of {TAIL ~ Examples} 15, 19, 20, 22, 25, and 26 
In another embodiment of this invention the compounds of formula are selected from the group consisting of the final compounds of { HEAD ~ Examples } 2 , 4 , 5 , 6 , 8 , 9 , 10 , 11 , and 14 , and the free base form of the final compounds of { TAIL ~ Examples } 15 , 19 , 20 , 22 , 25 , and 26
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