1 CUS (N-salicyliden-L-leucinato)-copper(II) 1.000 2 JI6 (6~{S})-6-[(1~{R})-1-oxidanylethyl]-2,4-dioxa-7$L^{4}-aza-3$L^{3}-cupratricyclo[7.4.0.0^{3,7}]trideca-1(13),7,9,11-tetraen-5-one 0.842 3 S0R (2s)-2-benzamido-4-methyl-pentanoic acid 0.750