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New 1-aryl- or 1-heteroaryl-piperazinylbutyl derivatives with pyrido[1,2-c]pyrimidine imide moiety, with the expected higher selectivity to 5-HT 1A receptors, have been synthesized. Five hydrochlorides and one base were studied by solid-state 13 C CPMAS NMR spectroscopy. 13 C chemical shifts indicated that the piperazine ring nitrogen N-1 was protonated. The crystal structure...
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