| http://www.w3.org/ns/prov#value | - of formula IA and formula IB compounds of the invention include those where B, L1, L2, R1 and R2 are as set out with respect to the preferred embodiments of the formula I compounds, q is 0 or 2 and Rx is H.Also preferred are compounds of the structure where B is A is NH,L2 is a bond,R2 is CF3CH2,,L1 is ???CH2CH2CH2??? or ???CH2CH2CH2CH2???, andR1 is heteroaryl which is a 5-membered aromatic ring
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