For example, (A) may be a derivative or radical: of pyrrolidine, that is, C4 H8 NH; of piperidine such as for example, piperidine and 3-methylpiperidine; of monoalkyl piperazine such as 4-alkylpiperazine including for example, 4-propylpiperazine; of perhydroazepine such as 3,3,5-trimethylhexahydoazepine and hexamethyleneimine; of 1-azacyclooctane; azacyclotridecane, also known as dodecamethyleneim