prov:value
| - or lower alkyl, especially hydrogen, and R3 signifies lower alkyl; cycloalkylene with 3 to 8, preferably 5 or 6, carbon atoms, piperidinediyl, piperazinediyl, phenylene, which can be substituted with lower alkyl, lower alkoxy, cyano, nitro or halogen; other spacer units are carbonate (???OCOO???), ester (???COO???, ???OOC???), amide (???CONR2???, ???R2NCO???), ether (???O???), amino (???NR2???), c
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