1-Propylpiperazine dihydrobromide64262-23-331 % similar 1-(2-Piperidinoethyl)piperazine22763-65-131 % similar 1-Ethylpiperazine5308-25-831 % similar Diaza-18-crown-623978-55-430 % similar 1,4,10-Trioxa-7,13-diazacyclopentadecane31249-95-330 % similar Aza-18-crown-633941-15-030 % similar Aza-15-crown-566943-05-330 % similar 4-(3-Methyl-piperidin-1-yl)-piperidine551923-14-930 % similar 1-(Tetrahydro-2-furylmethyl)piperazine82500-35-430 % similar 1-(1-Adamantyl)piperazine19984-46-430 % similar 1-(Cyclohexylmethyl)piperazine57184-23-330 % similar 1-(2-Diisopropylaminoethyl)piperazine59955-93-030 % similar