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γ-Rubromycin gamma-rubromycin (S)-4,5',8',9-Tetrahydro-4',9',10-trihydroxy-7'-methoxy-5',8',9-trioxospiro[benzo[1,2-b:5,4-c']dipyran-2(3H),2'(3'H)-naphtho[2,3-b]furan]-7-carboxylic acid methyl ester (2S)-4,5',8',9-Tetrahydro-4',9',10-trihydroxy-7'-methoxy-5',8',9-trioxospiro[benzo[1,2-b:5,4-c']dipyran-2(3H),2'(3'H)-naphtho[2,3-b]furan]-7-carboxylic acid methyl ester Spiro[benzo[1,2-b:5,4-c']dipyran-2(3H),2'(3'H)-naphtho[2,3-b]furan]-7-carboxylic acid, 4,5',8',9-tetrahydro-4',9',10-trihydroxy-7'-methoxy-5',8',9-trioxo-, methyl ester, (2S)-