1,7-diboc-1,4,7,10-tetraazacyclododecane

1,7-bis(ethoxycarbonyl)-1,4,7,10-tetraazacyclododecane

1,7-bis(methoxycarbonyl)-1,4,7,10-tetraazacyclododecane

1,4,7,10-tetraaza-cyclododecane-1,7-dicarboxylic acid dibenzyl ester

2a,4a,6a,8a-Decahydro-tetraazacyclopent[fg]acenaphthylene