. "20,23-dimethyl-17-oxa-4,14,20,23,26-pentaazahexacyclo[24.6.1.17,14.02,6.08,13.027,32]tetratriaconta-1(33),2(6),7(34),8(13),9,11,27(32),28,30-nonaene-3,5-dione" . "23" . . . . . . . . . . . . .