GRAH..IM LE..\DBBTTER AND KENNETH L. RINEHART, JR. Noyes Chewtical Laboratory, University of Illi?tois, Urbane, Illi?tois Received November 13, 1964 ... Dedicated to Professor R. B. Sandin on the Occasion of his Sixty-Eighth Birthday ... ABSTRrlCT 4,5-Dirnethyl-2,7-dioxo-l,2,7,8-tetr ?h~ldro-l,8-diazaanthracene, ... The water-insoluble antibiotic nyboinycin (1, 2) was recently assigned (3) structure I (l-forin~~l-4-hydroxyi11ethyl-5,8-dirnethy1-2,7-dioxo-l,2,7,8- ...