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Ethyl 1-piperazinecarboxylate120-43-4100 % similar Ethyl 4-(methylamino)-1-piperidinecarboxylate73733-69-462 % similar 1-(Ethoxycarbonyl)-4-piperidone29976-53-261 % similar Methyl piperazine-1-carboxylate50606-31-060 % similar 4-(2-Hydroxyethyl)-piperazin-1-carboxylic acid ethyl ester14000-66-959 % similar Ethyl 4-amino-1-piperidinecarboxylate58859-46-456 % similar Ethyl 4-hydroxypiperidine-1-carboxylate65214-82-656 % similar tert-Butyl piperazine-1-carboxylate57260-71-655 % similar 1-N-Ethoxycarbonyl-3-pyrrolidone14891-10-253 % similar Ethyl piperazine-1-acetate40004-08-853 % similar 1-(Ethoxycarbonyl)-4-piperidinecarboxylic acid118133-15-651 % similar Benzyl piperazine-1-carboxylate31166-44-651 % similar tert-Butyl 1,4-diazepane-1-carboxylate112275-50-049 % similar Benzyl 1,4-diazepane-1-carboxylate117009-97-948 % similar N,N-Diethyl-1-piperazinecarboxamide119-54-045 % similar 1-Acetylpiperazine13889-98-045 % similar 1-Boc-piperazine acetate143238-38-444 % similar Ethyl isonipecotate1126-09-643 % similar N-Methyl-N-nitrosourethane615-53-243 % similar Piperazine-1-carboxylic acid dimethylamide41340-78-742 % similar