| http://www.w3.org/ns/prov#value | - A compound according to claim 1 wherein A1 is methine, A2 is ???S???, R1 is hydrogen, Z is 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. 12.
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