J. Zaccardi et al., STRUCTURES OF THE BIOXALOMYCINS AND THEIR RELATIONSHIP TO NAPHTHYRIDINOMYCIN, Journal of organic chemistry, 59(15), 1994, pp. 4045-4047
Bioxalomycins alpha 1, alpha 2, beta 1, and beta 2 are novel compounds
with potent antimicrobial and antitumor activity isolated from fermen
tation broths of Streptomyces viridostaticus. These structures are clo
sely related to that of naphthyridinomycin and call into question the
published structure of the naturally occurring form of that antitumor
antibiotic.