COORDINATION TO COPPER(II) BY ONLY 3 NITROGEN-ATOMS OF A TETRA-AZAMACROCYCLIC LIGAND FUNCTIONALIZED WITH 2 PENDANT ACETATE-ARMS - X-RAY STRUCTURE OF [CU(L1H2)CL]CL, WHERE L-1 IS 3,11-DIACETATO-7-METHYL-3,7,11,17-TETRAAZABICYCLO[11.3.1]HEPTADECA-1(17),13,15-TRIENE