prov:value
| - ???CH2CF3, ???(CH2)gCOOR43, ???COOR43, ???(CH2)k???CN or ???(CH2)kNR6aR6b wherein g, k, R43, R6a and R5b are as defined for formula I.Preferably, g and k are independently 1, 2 or 3,and R6a and R6b are independently hydrogen, lower alkyl such as methyl or ethyl, or aryl such as phenyl,In the above embodiments of K, R3a and R3b are preferably independently hydrogen, halogen, ???OH, ???O-lower alkyl
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