1,1'-[1,4-Phenylenebis(methylene)]bis[1,4,8,11-tetraazacyclotetradecane]; 1,4-Bis[(1,4,8,11-tetraazacyclotetradecan-1-yl)methyl]benzene; 1-[[4-(1,4,8,11-tetrazacyclotetradec-1-ylmethyl)phenyl]methyl]-1,4,8,11-tetrazacyclotetradecane