3,12-Bis-(3-trifluoromethyl-benzyl)-3,7,12,18-tetraaza-bicyclo[12.3.1]octadeca-1(18),14,16-triene-7-carboxylic acid tert-butyl ester
3,12-Bis-(3-nitro-benzyl)-3,7,12,18-tetraaza-bicyclo[12.3.1]octadeca-1(18),14,16-triene-7-carboxylic acid tert-butyl ester
3,12-Bis-(3-methoxycarbonyl-benzyl)-3,7,12,18-tetraaza-bicyclo[12.3.1]octadeca-1(18),14,16-triene-7-carboxylic acid tert-butyl ester
3,12-Bis-(3-trifluoromethyl-benzyl)-3,7,12,18-tetraaza-bicyclo[12.3.1]octadeca-1(18),14,16-triene