P. Brookes, R. J. Terry and James Walker
The chemotherapy of filariasis. Analogues of diethylcarbamazine (1-diethylcarbamoyl-4-methylpiperazine) derived from 2 : 4 - and 4 : 4 -dipiperidyl, homopiperazine, and 4-aminopiperidine
J. Chem. Soc., 1957, 3165
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http://dx.doi.org/10.1039/JR9570003165