The molecule is a cyclic pentapyrrole where the five pyrrole units are joined at their 2- and 5-positions via four methine linkages and one direct 2-5'-linkage.
25,26,27,28,29-pentazahexacyclo[20.2.1.12,5.17,10.112,15.117,20]nonacosa-1(25),2(29),3,5,7,9,11,13,15,17,19,21,23-tridecaene