| http://www.w3.org/ns/prov#value | - Z is [0338] wherein R2 is OR8 wherein R8 is methyl, R3 is cyclopropyl, R4 is OR11 wherein R11 is hydrogen, R15 is hydrogen, R5 and R6 together are an optionally substituted carbocyclic ring and the substituent is amino, are contemplated as being within the scope of the present invention. [0339] Specific compounds of the invention include [0340] 1-cyclopropyl-4-oxo-7-(4,5,6,7-tetrahydrothieno[3,2-c
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