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nmr spectrum of 11 one of the aryl methyl groups ( 2.84 , J = 1.0 Hz) is slightly split by an adjacent aromatic proton ( 7.45 octet, J = 8.0, 1.0 Hz), while the second aryl methyl ( 2.73 s), found at nearly identical field but with no adjacent hydrogens, is unsplit. Of the two theoretically possible combinations of units a and b, that represented in 1 is chosen over the alternative, 1 -carbomethoxy -8 -f ormyl -4,5,7 -trihydr oxyphenazin e, on biosynthetic grounds, since we presume lomofungin to arise from oxidative coupling of 2 mol of 4-hydroxyanthranilic acid. In this connection it is significant that a similar substitution pattern is found in the antibiotic griseolutein A.7 Synthetic experiments in the lomofungin series will be described in a subsequent report.8Acknowledgment. This work was supported in part by a research grant (No. AI 01278) from the National Institute of Allergy and Infectious Diseases.(7) S. Nakamura, J. Antibiot. (Tokyo), A12, 55 (1957).(8) Note Added in Proof. Compound 11 has now been prepared by an unequivocal route.