(1S,7S,10S,13S,16S,17S,4R)-3,6,9,12,15,29-Hexaaza-10-[(3,4-dihydroxyphenyl)methyl]-17,24-dihydroxy-4,7,9,13,15,29-hexamethyl-22-oxatetracyclo[14.12.2.2<18,21